Description of problem:
The Glusterfs mounts listed in /etc/fstab are not mounted at boot.

Version-Release number of selected component (if applicable):
cat /etc/redhat-release
Red Hat Enterprise Linux Server release 7.2 (Maipo)
glusterd --version
glusterfs 3.7.8 built on Mar 10 2016 20:20:45

How reproducible:
Everytime

Steps to Reproduce:
1. Add a line to mount local gluster volume vol1 in /etc/fstab:
myserver:/vol1 /mnt/test glusterfs defaults,_netdev 0 0
2. Make sure glusterd is enabled and running (systemctl status glusterd)
3. Manually mount /mnt/test: it works
4. Now, reboot the server
5. Make sure glusterd is running
6. Verify that /mnt/test is mounted

Actual results:
Not mounted

Expected results:
Mounted.

Additional info:
The log /var/log/glusterfs/mnt-test.log says:

[2016-03-14 14:28:53.298107] E [MSGID: 114058] [client-handshake.c:1524:client_query_portmap_cbk] 0-vol1-client-1: failed to get the port number for remote subvolume. Please run 'gluster volume status' on server to see if brick process is running.
[2016-03-14 14:28:53.298236] I [MSGID: 114018] [client.c:2030:client_rpc_notify] 0-vol1-client-1: disconnected from vol1-client-1. Client process will keep trying to connect to glusterd until brick's port is available
[2016-03-14 14:28:53.298271] E [MSGID: 108006] [afr-common.c:4015:afr_notify] 0-vol1-replicate-0: All subvolumes are down. Going offline until atleast one of them comes back up.
[2016-03-14 14:28:53.304312] I [fuse-bridge.c:5139:fuse_graph_setup] 0-fuse: switched to graph 0
[2016-03-14 14:28:53.305185] I [fuse-bridge.c:4060:fuse_init] 0-glusterfs-fuse: FUSE inited with protocol versions: glusterfs 7.22 kernel 7.22
[2016-03-14 14:28:53.305425] I [MSGID: 108006] [afr-common.c:4143:afr_local_init] 0-vol1-replicate-0: no subvolumes up
[2016-03-14 14:28:53.307306] W [fuse-bridge.c:758:fuse_attr_cbk] 0-glusterfs-fuse: 2: LOOKUP() / => -1 (Transport endpoint is not connected)
[2016-03-14 14:28:53.318197] I [fuse-bridge.c:4986:fuse_thread_proc] 0-fuse: unmounting /mnt/test
The message "I [MSGID: 108006] [afr-common.c:4143:afr_local_init] 0-vol1-replicate-0: no subvolumes up" repeated 2 times between [2016-03-14 14:28:53.305425] and [2016-03-14 14:28:53.316897]
[2016-03-14 14:28:53.321196] W [glusterfsd.c:1236:cleanup_and_exit] (-->/lib64/libpthread.so.0(+0x7dc5) [0x7ff87fdbcdc5] -->/usr/sbin/glusterfs(glusterfs_sigwaiter+0xe5) [0x7ff881427905] -->/usr/sbin/glusterfs(cleanup_and_exit+0x69) [0x7ff881427789] ) 0-: received signum (15), shutting down
[2016-03-14 14:28:53.321225] I [fuse-bridge.c:5685:fini] 0-fuse: Unmounting '/mnt/test'.

Notes:
- I also tried to manually create a Systemd unit in /etc/systemd/system/mnt-test.mount with "After=glusterd.service" and "After=glusterd.service sys-module-fuse.device", but it doesn't help to mount this path at boot.
- Manually mounting works everytime; it must be a timing problem during the boot.