Ensure that ns_single_vbucket_mover is loaded on the remote node.
Ensure that ns_single_vbucket_mover is loaded on the remote node.

Before spawning a mover on a remote node ns_single_vbucket_mover
checks whether the module exists on that node. If it does not then it
uploads local version of the module to the node.

Change-Id: I2acd5982eca61723cdf231800c41afa46a5ad88e
Reviewed-on: http://review.couchbase.org/8578
Tested-by: Aliaksey Artamonau <3c875bcfb3adf2a65b2ae7686ca921e6c9433147@gmail.com>
Reviewed-by: Dale Harvey <491ccac09a36ad1e38b698f273b84fd8efc31071@arandomurl.com>
Tested-by: Dale Harvey <491ccac09a36ad1e38b698f273b84fd8efc31071@arandomurl.com>

ceejatec/ns_server,daverigby/ns_server,nimishzynga/ns_server,t3rm1n4l/ns_server,nimishzynga/ns_server,mschoch/ns_server,nimishzynga/ns_server,membase/ns_server,vzasade/ns_server,nimishzynga/ns_server,membase/ns_server,vzasade/ns_server,t3rm1n4l/ns_server,vzasade/ns_server,membase/ns_server,ceejatec/ns_server,daverigby/ns_server,mschoch/ns_server,t3rm1n4l/ns_server,ceejatec/ns_server,vzasade/ns_server,ceejatec/ns_server,daverigby/ns_server,mschoch/ns_server,t3rm1n4l/ns_server,nimishzynga/ns_server,t3rm1n4l/ns_server,membase/ns_server,daverigby/ns_server,membase/ns_server,ceejatec/ns_server,ceejatec/ns_server,mschoch/ns_server,membase/ns_server,mschoch/ns_server,daverigby/ns_server,nimishzynga/ns_server,mschoch/ns_server,pavel-blagodov/ns_server,pavel-blagodov/ns_server,pavel-blagodov/ns_server,pavel-blagodov/ns_server