Description of problem:
glusterd regression failure on centos for arbiter-mount.t test case

Version-Release number of selected component (if applicable):

Further debugging is required on centos slave machine to debug the issue.
 
How reproducible:

Steps to Reproduce:
1.
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Actual results:
glusterd regression is getting failed while executing  "tests/basic/afr/arbiter-mount.t "test case.

 Test Summary Report
14:16:27 -------------------
14:16:27 ./tests/basic/afr/arbiter-mount.t (Wstat: 0 Tests: 22 Failed: 4)
14:16:27   Failed tests:  7, 17, 21-22
14:16:27 Files=1, Tests=22, 71 wallclock secs ( 0.03 usr  0.01 sys +  1.54 cusr  2.42 csys =  4.00 CPU)
14:16:27 Result: FAIL
14:16:27 End of test ./tests/basic/afr/arbiter-mount.t

Here is the link of logs generated by jenkins :-
https://build.gluster.org/job/centos6-regression/3732/consoleFull

Expected results:


Additional info:

I executed tests/basic/afr/arbiter-mount.t script explicitly, but this test-case passed for me.

prove tests/basic/afr/arbiter-mount.t 
tests/basic/afr/arbiter-mount.t .. 9/22 rm: cannot remove '/mnt/glusterfs/0/xy_zzy': Transport endpoint is not connected
tests/basic/afr/arbiter-mount.t .. 10/22 mount.nfs: Remote I/O error
tests/basic/afr/arbiter-mount.t .. ok     
All tests successful.
Files=1, Tests=22, 55 wallclock secs ( 0.03 usr  0.00 sys +  0.69 cusr  0.55 csys =  1.27 CPU)
Result: PASS