Check written socket data of all subtests.
socket data, kern_priority:
<8>Feb 13 23:31:30 prio: message

socket data, kern_priority_numeric:
<8>Feb 13 23:31:30 prio: message

socket data, invalid_prio:

socket data, rfc5424_exceed_size:
<13>1 2009-02-13T23:31:30.123456+00:00 test-hostname rfc5424_exceed_size - - [timeQuality tzKnown="1" isSynced="0"] abc

socket data, id_with_space:

socket data, id_with_space:

socket data, id_with_space:

socket data, id_with_space:
<13>Feb 13 23:31:30 id_with_leading space[123]: message

socket data, id_with_space:

socket data, tag_with_space:
<13>Feb 13 23:31:30 A B: tag_with_space

socket data, tag_with_space:
<13>1 2009-02-13T23:31:30.123456+00:00 test-hostname A B - - [timeQuality tzKnown="1" isSynced="0"] tag_with_space_rfc5424

socket data, tcp:
<13>Feb 13 23:31:30 tcp: message

socket data, multi-line:
<13>Feb 13 23:31:30 multi: AAA
<13>Feb 13 23:31:30 multi: BBB
<13>Feb 13 23:31:30 multi: CCC

socket data, rfc5424_msgid_with_space:

socket data, invalid_socket: