{UPR}:: Rebalance-out hangs due to indexing stuck

Seeing this issue in 991

1. Create 7 node cluster (10.6.2.144-150)
2. Create default Bucket
3. Add 1K items
4. Create 5 views and query
5. Rebalance out node 10.6.2.150

Step 4 and 5 are run in parallel

We see the rebalance hanging

I am seeing the following issue couchdb log in 10.6.2.150

[couchdb:error,2014-07-22T13:37:52.699,ns_1@10.6.2.150:<0.217.0>:couch_log:error:44]View merger, revision mismatch for design document `_design/ddoc1', wanted 5-3275804e, got 5-3275804e
[couchdb:error,2014-07-22T13:37:52.699,ns_1@10.6.2.150:<0.217.0>:couch_log:error:44]Uncaught error in HTTP request: {throw,{error,revision_mismatch}}

[couchdb:error,2014-07-22T13:37:52.699,ns_1@10.6.2.150:<0.217.0>:couch_log:error:44]View merger, revision mismatch for design document `_design/ddoc1', wanted 5-3275804e, got 5-3275804e
[couchdb:error,2014-07-22T13:37:52.699,ns_1@10.6.2.150:<0.217.0>:couch_log:error:44]Uncaught error in HTTP request: {throw,{error,revision_mismatch}}

Stacktrace: [{couch_index_merger,query_index,3,
[

{file, "/buildbot/build_slave/centos-5-x64-300-builder/build/build/couchdb/src/couch_index_merger/src/couch_index_merger.erl"}

,

{line,75}

]},
{couch_httpd,handle_request,6,
[

{file, "/buildbot/build_slave/centos-5-x64-300-builder/build/build/couchdb/src/couchdb/couch_httpd.erl"}

,

{line,222}

]},
{mochiweb_http,headers,5,

Will attach logs ASAP

Test Case:: ./testrunner i ubuntu_x64109_00-Rebalance-Out.ini get-cbcollect-info=False,get-logs=False,stop-on-failure=False,get-coredumps=True,force_kill_memached=False,verify_unacked_bytes=True,dgm=True,total_vbuckets=128,std_vbuckets=5 -t rebalance.rebalanceout.RebalanceOutTests.rebalance_out_with_queries,nodes_out=1,blob_generator=False,value_size=1024,GROUP=OUT;BASIC;P0;FROM_2_0