CCBC-159 Fix MockUnitTest.testPurgedBody
CCBC-159 Fix MockUnitTest.testPurgedBody

Update socket timer only if there was real job done like reading or
writing data.

Fixes http://sdkbuilds.couchbase.com/job/libcouchbase/406

Change-Id: I6415b7c6d7ba64ef0fdeb722e92ecc98c4208ae7
Reviewed-on: http://review.couchbase.org/23668
Reviewed-by: Trond Norbye <60edd2ef23891a753f231b0c6f161dc634079a93@gmail.com>
Tested-by: Trond Norbye <60edd2ef23891a753f231b0c6f161dc634079a93@gmail.com>

mnunberg/libcouchbase,avsej/libcouchbase,couchbase/libcouchbase,couchbase/libcouchbase,avsej/libcouchbase,trondn/libcouchbase,maxim-ky/libcouchbase,signmotion/libcouchbase,couchbase/libcouchbase,PureSwift/libcouchbase,trondn/libcouchbase,trondn/libcouchbase,kojiromike/libcouchbase,senthilkumaranb/libcouchbase,uvenum/libcouchbase,signmotion/libcouchbase,avsej/libcouchbase,mody/libcouchbase,mody/libcouchbase,mnunberg/libcouchbase,senthilkumaranb/libcouchbase,PureSwift/libcouchbase,kojiromike/libcouchbase,mody/libcouchbase,mnunberg/libcouchbase,couchbase/libcouchbase,kojiromike/libcouchbase,couchbase/libcouchbase,kojiromike/libcouchbase,senthilkumaranb/libcouchbase,uvenum/libcouchbase,trondn/libcouchbase,avsej/libcouchbase,senthilkumaranb/libcouchbase,avsej/libcouchbase,maxim-ky/libcouchbase,signmotion/libcouchbase,maxim-ky/libcouchbase,PureSwift/libcouchbase,mnunberg/libcouchbase,trondn/libcouchbase,couchbase/libcouchbase,avsej/libcouchbase,signmotion/libcouchbase,uvenum/libcouchbase,uvenum/libcouchbase,maxim-ky/libcouchbase,couchbase/libcouchbase,avsej/libcouchbase,uvenum/libcouchbase,PureSwift/libcouchbase,mody/libcouchbase,mnunberg/libcouchbase