config+lsdb: Retry retrieve each LSA for `lsa-refresh-time`

This commit also includes extension of the config file
(`lsa-interest-lifetime` parameter in general section)

Change-Id: Ifd01af8cc98d41f7bdc953799a280e4b4269a358
Refs: #1873, #1874
diff --git a/src/nlsr.cpp b/src/nlsr.cpp
index 3ee4ccd..893809a 100644
--- a/src/nlsr.cpp
+++ b/src/nlsr.cpp
@@ -122,7 +122,7 @@
 {
   _LOG_DEBUG("Initializing Nlsr");
   m_confParam.buildRouterPrefix();
-  m_nlsrLsdb.setLsaRefreshTime(m_confParam.getLsaRefreshTime());
+  m_nlsrLsdb.setLsaRefreshTime(ndn::time::seconds(m_confParam.getLsaRefreshTime()));
   m_nlsrLsdb.setThisRouterPrefix(m_confParam.getRouterPrefix().toUri());
   m_fib.setEntryRefreshTime(2 * m_confParam.getLsaRefreshTime());
   m_sequencingManager.setSeqFileName(m_confParam.getSeqFileDir());