build:  Add perl installation dependency to rpm and debian packages.

There was already a dependency on python in the debian control file,
a similar dependency was added to the rpm spec file.  perl is needed
for the logrotate script, so a dependecy was on perl wass added to
both. Bug 3768.

Signed-off-by: Gary Lowell  <gary.lowell@inktank.com>
Merge git://github.com/ceph/ceph