failing api tests #3

Api tests got broken on master a while back. Most are fixed but 10 remain. I think they stem from 3 pieces of work so am logging 3 tickets so the relevant people can fix them & they don't stay broken. This is ticket 2

https://test.civicrm.org/job/CiviCRM-master-git/LABEL=debian6,SUITE=api_v3_AllTests/19/testReport/

>>> api_v3_MailingContactTest.testMailingContactDelivered 0.18 sec 9
>>> api_v3_SyntaxConformanceAllEntitiesTest::testSimple_get.testSimple_get with data set #35 0.34 sec 9
>>> api_v3_SyntaxConformanceAllEntitiesTest::testAcceptsOnlyID_get.testAcceptsOnlyID_get with data set #35 0.34 sec 9
>>> api_v3_SyntaxConformanceAllEntitiesTest::testCreateSingleValueAlter.testCreateSingleValueAlter with data set #8

These relate to the mailing contact api. The last 3 are syntax conformance & this API may need to be skipped as it is a pseudo-api - which works to make the structure look as if it were structured in one table instead of several (which it probably should be).