Add NTP configuration tables (#781)

Signed-off-by: Yevhen Fastiuk <[email protected]>
Co-authored-by: Liat Grozovik <[email protected]>

Author: fastiuk

common/schema.h

@@ -299,7 +299,9 @@ namespace swss {
 #define CFG_MGMT_VRF_CONFIG_TABLE_NAME    "MGMT_VRF_CONFIG"
 
 #define CFG_DHCP_SERVER_TABLE_NAME   "DHCP_SERVER"
+#define CFG_NTP_GLOBAL_TABLE_NAME    "NTP"
 #define CFG_NTP_SERVER_TABLE_NAME    "NTP_SERVER"
+#define CFG_NTP_KEY_TABLE_NAME       "NTP_KEY"
 #define CFG_SYSLOG_SERVER_TABLE_NAME "SYSLOG_SERVER"
 #define CFG_SYSLOG_CONFIG_TABLE_NAME "SYSLOG_CONFIG"