cbc: throw error if store op couldn't be scheduled
cbc: throw error if store op couldn't be scheduled

Change-Id: I7fc2c6be1049e59d50020aa311686ec6ef7b86bc
Reviewed-on: http://review.couchbase.org/53610
Reviewed-by: Subhashni Balakrishnan <7129c8e37b832c7bd362ff375532d24b98ef5162@gmail.com>
Tested-by: buildbot <80754af91bfb6d1073585b046fe0a474ce868509@couchbase.com>

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