Create separate file for ConfigMgr class

As the ldap_configuration.cpp was getting long
so it is good to create the seprate file for
ConfigMgr.

TestedBy:
         Ran the unit test.

Signed-off-by: Ratan Gupta <ratagupt@linux.vnet.ibm.com>
Change-Id: I312a9f423d4ab3ca4ebd5f17193f7b02162ded6b
diff --git a/phosphor-ldap-config/main.cpp b/phosphor-ldap-config/main.cpp
index 2e3bf66..c6eaa5a 100644
--- a/phosphor-ldap-config/main.cpp
+++ b/phosphor-ldap-config/main.cpp
@@ -1,5 +1,5 @@
 #include "config.h"
-#include "ldap_configuration.hpp"
+#include "ldap_config_mgr.hpp"
 #include <experimental/filesystem>
 #include <phosphor-logging/log.hpp>
 #include <phosphor-logging/elog-errors.hpp>