tests: Fix spurious failure in tests/bugs/bug-830665.t

Problem with script:
EXPECT_WITHIN fails the test if the command it executes fails.
There is a possibility that the file script tries to 'cat' may not exist.
In those cases it would fail leading to spurious failures.

Fix:
Add a function which returns empty string when the file doesn't exist
and 'cat' file when it does exist.

Change-Id: I0abfb343f2fce1034ee4b5b680e3783c4f6e8486
BUG: 1092850
Signed-off-by: Pranith Kumar K <pkarampu@redhat.com>
Reviewed-on: http://review.gluster.org/8057
Reviewed-by: Sachin Pandit <spandit@redhat.com>
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Vijay Bellur <vbellur@redhat.com>

0 files changed, 0 insertions, 0 deletions