mgmt/glusterd: Reset context upon operation completion
mgmt/glusterd: Reset context upon operation completion

Signed-off-by: Vijay Bellur <vijay@gluster.com>

BUG: 2650 (replace brick failed in distributed-replicated setup)
URL: http://bugs.gluster.com/cgi-bin/bugzilla3/show_bug.cgi?id=2650

Kaushikbv/Gluster,Kaushikbv/Gluster,Kaushikbv/Gluster