translate_acl invalid TCP_FLAGS issue

[stcheng]

        "ACL_RULE_TABLE:search_global_outbound_acl:Rule_1":{
            "IP_PROTOCOL":6,
            "PACKET_ACTION":"FORWARD",
            "TCP_FLAGS":"0x10",
            "priority":9999
        },
        "OP":"SET"

will trigger ERR orchagent: :- validateAddMatch: Invalid TCP flags format 0x10 as in orchagent, if (flagsData.size() != 2) // expect two parts flags and mask separated with '/'.

[stcheng]

#697 resolved