Issue #666: Added variable for OS name

Signed-off-by: blesson-james <blesson_james@Dellteam.com>

roles/common/vars/main.yml

@@ -52,6 +52,7 @@ ntp_path: "/etc/ntp.conf"
 ntp_mode: "0644"
 os_higher_version: "8"
 os_version: "7"
+os_name: "CentOS"
 retry_count_one: "10"
 delay_count_one: "60"
 retry_count: "6"