changelog: replace MAKE_HTIME_FILE_PATH with snprintf()

The used once MAKE_HTIME_FILE_PATH macro uses strcpy and strcat into a
fixed buffer without checking the input lengths.

Recommend replacing with a snprintf.

Change-Id: Ia0245096774dc84be1b937e1d5750f3634fff034
BUG: 1099645
Reported-by: Keith Schincke <kschinck@redhat.com>
Signed-off-by: Niels de Vos <ndevos@redhat.com>
Reviewed-on: http://review.gluster.org/8977
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Venky Shankar <vshankar@redhat.com>
Tested-by: Venky Shankar <vshankar@redhat.com>