[MB-11548] Perform a less strict check on the current time

Perform a less strict check on the current time as we may see
59/61 seconds which isn't neccesarily a clock change.

Also update warning message to show the difference in time.

Change-Id: I524640de83de0159733d2813d55fec523b774e65
Reviewed-on: http://review.couchbase.org/40172
Reviewed-by: Trond Norbye <trond.norbye@gmail.com>
Tested-by: Trond Norbye <trond.norbye@gmail.com>
[MB-11203] Enable SSL for all tests that use a socket.

Add some more focused stream/pipeline tests.

Overall increase of about 2% code coverage in memcached.c

Change-Id: Ia0b8ffbb84e53e0bd38eaf3d3641ae92161e2d92
Reviewed-on: http://review.couchbase.org/40185
Reviewed-by: Trond Norbye <trond.norbye@gmail.com>
Tested-by: Trond Norbye <trond.norbye@gmail.com>
Merge remote-tracking branch 'membase/3.0'

* membase/3.0:
  [MB-11203] Enable SSL for all tests that use a socket.
  [MB-11548] Perform a less strict check on the current time

Conflicts:
	tests/testapp.c

Change-Id: Ib9646fb43b5bae03e7befd69b8f159a8f14d8ad7