RHGS - 'glusterd cannot start' or 'volumes cannot be deleted'

Issue

When /var/lib/glusterd/vols is corrupted, then glusterd may fail to start, displaying the following messages:

[2016-05-05 15:48:38.557928] I [MSGID: 100030] [glusterfsd.c:1998:main] 0-/usr/sbin/glusterd: Started running /usr/sbin/glusterd version 3.6.0.28 (args: /usr/sbin/glusterd --pid-file=/run/glusterd.pid)
[2016-05-05 15:48:38.564133] I [glusterd.c:1188:init] 0-management: Maximum allowed open file descriptors set to 65536
[2016-05-05 15:48:38.564183] I [glusterd.c:1233:init] 0-management: Using /var/lib/glusterd as working directory
[2016-05-05 15:48:38.568055] W [rdma.c:4194:__gf_rdma_ctx_create] 0-rpc-transport/rdma: rdma_cm event channel creation failed (No such device)
[2016-05-05 15:48:38.568086] E [rdma.c:4482:init] 0-rdma.management: Failed to initialize IB Device
[2016-05-05 15:48:38.568098] E [rpc-transport.c:333:rpc_transport_load] 0-rpc-transport: 'rdma' initialization failed
[2016-05-05 15:48:38.568264] W [rpcsvc.c:1524:rpcsvc_transport_create] 0-rpc-service: cannot create listener, initing the transport failed
[2016-05-05 15:48:41.784623] I [glusterd-store.c:1944:glusterd_restore_op_version] 0-glusterd: retrieved op-version: 30000
[2016-05-05 15:48:42.777367] E [glusterd-store.c:2444:glusterd_store_update_volinfo] 0-management: Failed to get next store iter
[2016-05-05 15:48:42.777388] E [glusterd-store.c:2667:glusterd_store_retrieve_volume] 0-management: Failed to update volinfo for test-volume1 volume
[2016-05-05 15:48:42.777406] E [glusterd-store.c:2856:glusterd_store_retrieve_volumes] 0-: Unable to restore volume: test-volume1
[2016-05-05 15:48:42.777455] E [xlator.c:406:xlator_init] 0-management: Initialization of volume 'management' failed, review your volfile again
[2016-05-05 15:48:42.777469] E [graph.c:322:glusterfs_graph_init] 0-management: initializing translator failed
[2016-05-05 15:48:42.777479] E [graph.c:525:glusterfs_graph_activate] 0-graph: init failed
[2016-05-05 15:48:42.778256] W [glusterfsd.c:1182:cleanup_and_exit] (--> 0-: received signum (0), shutting down

Also volumes may not be able to be deleted with the following message:

# gluster vol delete <vol>

Deleting volume will erase all information about the volume. Do you want to
continue? (y/n) y

volume delete: <vol>: failed: Staging failed on nodeb. Error:
Volume <vol> does not exist