Reduce usage of std::bind()

C++14 lambdas are easier to read, easier to debug,
and can usually be better optimized by the compiler.

Change-Id: I294f275904f91942a8de946fe63e77078a7608a6
diff --git a/daemon/mgmt/command-authenticator.cpp b/daemon/mgmt/command-authenticator.cpp
index 2196889..7c3cb23 100644
--- a/daemon/mgmt/command-authenticator.cpp
+++ b/daemon/mgmt/command-authenticator.cpp
@@ -107,8 +107,9 @@
 void
 CommandAuthenticator::setConfigFile(ConfigFile& configFile)
 {
-  configFile.addSectionHandler("authorizations",
-    bind(&CommandAuthenticator::processConfig, this, _1, _2, _3));
+  configFile.addSectionHandler("authorizations", [this] (auto&&... args) {
+    processConfig(std::forward<decltype(args)>(args)...);
+  });
 }
 
 void