Implement command GetDateTime

This commit implements the GetDateTime command which is
defined in PLDM Bios Control and Configuration Specification.

Change-Id: Iced21bbad7be07d357b6885b1b1e03b07a3da165
Signed-off-by: Sampa Misra <sampmisr@in.ibm.com>
diff --git a/.gitignore b/.gitignore
index bdc08da..26a8d6d 100644
--- a/.gitignore
+++ b/.gitignore
@@ -62,4 +62,5 @@
 /test/*.gcno
 /test/libpldm_base_test
 /test/libpldmresponder_base_test
-
+/test/libpldm_bios_test
+/test/libpldmresponder_bios_formatTime_test