Don't do inplace replacement of values for incr/decr
Don't do inplace replacement of values for incr/decr

All other places in the code we assume "copy on write", so this breaks the
contract for the object. Other threads may use the internal buffer for
sending at the same time.

abhinavdangeti/memcached,mrkwse/memcached,daverigby/kv_engine,mrkwse/memcached,zbase/memcached,zbase/memcached,cloudrain21/memcached-1,owendCB/memcached,Metaswitch/memcached,cloudrain21/memcached-1,daverigby/memcached,daverigby/kv_engine,Metaswitch/memcached,mrkwse/memcached,abhinavdangeti/memcached,daverigby/kv_engine,mrkwse/memcached,owendCB/memcached,cloudrain21/memcached-1,daverigby/memcached,Metaswitch/memcached,couchbase/memcached,zbase/memcached,daverigby/memcached,jimwwalker/memcached,owendCB/memcached,abhinavdangeti/memcached,zbase/memcached,cloudrain21/memcached-1,Metaswitch/memcached,abhinavdangeti/memcached,abhinavdangeti/memcached,daverigby/memcached,couchbase/memcached,zbase/memcached,jimwwalker/memcached,couchbase/memcached,couchbase/memcached,Metaswitch/memcached,daverigby/kv_engine,jimwwalker/memcached,owendCB/memcached