Tests: retryer fixes
Tests: retryer fixes

syncWithNodeCount should have a timeout of 60 by default rather than 300
Ensure virtual destructor for Retryer class

Change-Id: I404900030470557131c01a08b3eb51133b6866c4
Reviewed-on: http://review.couchbase.org/63051
Tested-by: buildbot <80754af91bfb6d1073585b046fe0a474ce868509@couchbase.com>
Reviewed-by: Sergey Avseyev <87f6d5e4fd3644c3c20800cde7fd3ad1569370b3@gmail.com>

avsej/libcouchbase,couchbase/libcouchbase,couchbase/libcouchbase,mody/libcouchbase,avsej/libcouchbase,avsej/libcouchbase,kojiromike/libcouchbase,couchbase/libcouchbase,mody/libcouchbase,avsej/libcouchbase,couchbase/libcouchbase,couchbase/libcouchbase,kojiromike/libcouchbase,kojiromike/libcouchbase,mody/libcouchbase,avsej/libcouchbase,couchbase/libcouchbase,avsej/libcouchbase,kojiromike/libcouchbase,couchbase/libcouchbase,mody/libcouchbase,avsej/libcouchbase