[Backport] MB-12328: Convert the dcp mutation flags field to network order
[Backport] MB-12328: Convert the dcp mutation flags field to network order

Change-Id: I9feda82beff4e930e18d6127f538622225b86d8f
Reviewed-on: http://review.couchbase.org/42373
Reviewed-by: Chiyoung Seo <fcffc23db27b19ee4ebba46695ee6b50e09216a2@couchbase.com>
Tested-by: Michael Wiederhold <a17fed27eaa842282862ff7c1b9c8395a26ac320@couchbase.com>

owendCB/memcached,couchbase/memcached,couchbase/memcached,cloudrain21/memcached-1,mrkwse/memcached,owendCB/memcached,mrkwse/memcached,daverigby/memcached,couchbase/memcached,daverigby/kv_engine,daverigby/memcached,couchbase/memcached,owendCB/memcached,daverigby/kv_engine,daverigby/memcached,cloudrain21/memcached-1,daverigby/kv_engine,daverigby/kv_engine,cloudrain21/memcached-1,owendCB/memcached,mrkwse/memcached,mrkwse/memcached,daverigby/memcached,cloudrain21/memcached-1