Mount hangs because of connection delays

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hi,
When glusterfs mount process is coming up all cluster xlators wait for at least one event from all the children before propagating the status upwards. Sometimes client xlator takes upto 2 minutes to propogate this event(https://bugzilla.redhat.com/show_bug.cgi?id=1054694#c0) Due to this xavi implemented timer in ec notify where we treat a child as down if it doesn't come up in 10 seconds. Similar patch went up for review @http://review.gluster.org/#/c/11113 for afr. Kritika raised an interesting point in the review that all cluster xlators need to have this logic for the mount to not hang, and the correct place to fix it would be client xlator itself. i.e. add the timer logic in client xlator. Which seems like a better approach. I just want to take inputs from everyone before we go ahead in that direction. i.e. on PARENT_UP in client xlator it will start a timer and if no rpc notification is received in that timeout it treats the client xlator as down.

Pranith
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