all: Refactoring work with time using boost::chrono

Now the library has two clocks: time::steady_clock and
time::system_clock, following (boost|std)::chrono.  In addition to
standard now() method, the library contains several helpers to convert
to/from UnixTimestamp (microsecond resolution) and IsoString (optional
microsecond resolution).  The IsoString conversions use
boost::posix_time routines, since boost::chrono supports extended IO
support only starting boost version 1.52 (Boost Chrono V2).

This commit breaks compatibility with previous API.  All time-related
Data/Interest calls must explicitly use time units to specify
FreshnessPeriod/InterestLifetime.

Brief usage/conversion guide:

- creation of time units does not support double/float types.  If
  necessary to create time unit from double, ``ndn::duration<double>`` (for
  seconds) needs to be used instead.  In some cases, this would also
  require ``ndn::duration_cast``, if the target is not ``ndn::nanoseconds``.
- ndn::getNow, ndn::ndn_getNowMilliseconds, ndn::time::now are all
  removed in favor of the now() method in a specific clock:

    * time::system_clock::now();
    * time::steady_clock::now();

- When necessary to convert system_clock::TimePoint to unix timestamp,
  ``time::toUnixTimestamp`` can be used.  This method return number of
  milliseconds since UNIX epoch as ``ndn::time::milliseconds`` type.
  Use count() method to obtain number as an integral value.

Change-Id: Icd688bc6766e008d60c3d2888173627874526e47
Refs: #1152
diff --git a/tests/security/test-keychain.cpp b/tests/security/test-keychain.cpp
index 3e9b4fc..8a76b79 100644
--- a/tests/security/test-keychain.cpp
+++ b/tests/security/test-keychain.cpp
@@ -7,7 +7,6 @@
 #include <boost/test/unit_test.hpp>
 
 #include "security/key-chain.hpp"
-#include "util/time.hpp"
 
 using namespace std;
 
@@ -19,7 +18,8 @@
 {
   KeyChainImpl<SecPublicInfoSqlite3, SecTpmFile> keyChain;
 
-  Name identity(string("/TestKeyChain/ExportIdentity/") + boost::lexical_cast<std::string>(time::now()));
+  Name identity("/TestKeyChain/ExportIdentity/");
+  identity.appendVersion();
   keyChain.createIdentity(identity);
   
   shared_ptr<SecuredBag> exported = keyChain.exportIdentity(identity, "1234");
@@ -60,28 +60,30 @@
 {
   KeyChainImpl<SecPublicInfoSqlite3, SecTpmFile> keyChain;
   
-  Name identity(string("/TestKeyChain/PrepareIdentityCertificate/") + boost::lexical_cast<std::string>(time::now()));
+  Name identity("/TestKeyChain/PrepareIdentityCertificate/");
+  identity.appendVersion();
   keyChain.createIdentity(identity);
 
   vector<CertificateSubjectDescription> subjectDescription;
   Name lowerIdentity = identity;
-  lowerIdentity.append("Lower").append(boost::lexical_cast<std::string>(time::now()));
+  lowerIdentity.append("Lower").appendVersion();
   Name lowerKeyName = keyChain.generateRSAKeyPair(lowerIdentity, true);
   shared_ptr<IdentityCertificate> idCert
     = keyChain.prepareUnsignedIdentityCertificate(lowerKeyName, identity,
-						  time::now() / 1000000,
-						  time::now() / 1000000 + 630720000,
+						  time::system_clock::now(),
+						  time::system_clock::now() + time::days(365),
 						  subjectDescription);
   BOOST_CHECK(static_cast<bool>(idCert));
   BOOST_CHECK(idCert->getName().getPrefix(5) == Name().append(identity).append("KEY").append("Lower"));
 
 
-  Name anotherIdentity(string("/TestKeyChain/PrepareIdentityCertificate/Another/") + boost::lexical_cast<std::string>(time::now()));
+  Name anotherIdentity("/TestKeyChain/PrepareIdentityCertificate/Another/");
+  anotherIdentity.appendVersion();
   Name anotherKeyName = keyChain.generateRSAKeyPair(anotherIdentity, true);
   shared_ptr<IdentityCertificate> idCert2
     = keyChain.prepareUnsignedIdentityCertificate(anotherKeyName, identity,
-						  time::now() / 1000000,
-						  time::now() / 1000000 + 630720000,
+						  time::system_clock::now(),
+						  time::system_clock::now() + time::days(365),
 						  subjectDescription);
   BOOST_CHECK(static_cast<bool>(idCert2));
   BOOST_CHECK(idCert2->getName().getPrefix(5) == Name().append(anotherIdentity).append("KEY"));
@@ -90,8 +92,8 @@
   Name wrongKeyName1;
   shared_ptr<IdentityCertificate> idCert3
     = keyChain.prepareUnsignedIdentityCertificate(wrongKeyName1, identity,
-						  time::now() / 1000000,
-						  time::now() / 1000000 + 630720000,
+						  time::system_clock::now(),
+						  time::system_clock::now() + time::days(365),
 						  subjectDescription);
   BOOST_CHECK(!static_cast<bool>(idCert3));
 
@@ -99,8 +101,8 @@
   Name wrongKeyName2("/TestKeyChain/PrepareIdentityCertificate");
   shared_ptr<IdentityCertificate> idCert4
     = keyChain.prepareUnsignedIdentityCertificate(wrongKeyName2, identity,
-						  time::now() / 1000000,
-						  time::now() / 1000000 + 630720000,
+						  time::system_clock::now(),
+						  time::system_clock::now() + time::days(365),
 						  subjectDescription);
   BOOST_CHECK(!static_cast<bool>(idCert4));
   
@@ -108,8 +110,8 @@
   Name wrongKeyName3("/TestKeyChain/PrepareIdentityCertificate/ksk-1234");
   shared_ptr<IdentityCertificate> idCert5
     = keyChain.prepareUnsignedIdentityCertificate(wrongKeyName3, identity,
-						  time::now() / 1000000,
-						  time::now() / 1000000 + 630720000,
+						  time::system_clock::now(),
+						  time::system_clock::now() + time::days(365),
 						  subjectDescription);
   BOOST_CHECK(!static_cast<bool>(idCert5));