Replace mktemp(3) with mkstemp(3).

Man page states:
Some implementations follow 4.3BSD and replace XXXXXX by the current process ID
and a single letter, so that at most 26 different names can be returned.  Since
on the one hand the names are easy to guess, and on the other hand there is a
race between testing whether the name exists and opening the file, every use of
mktemp() is a security risk. The race is avoided by mkstemp(3).

Change-Id: Ida95403b55024ecd07ef811a0835e01a9a7f092b
BUG: 3331
Reviewed-on: http://review.gluster.com/163
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Amar Tumballi <amar@gluster.com>

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