Bump file descriptors to 32768

Ideally this should be setup from /etc/defaults/asterisk.  Must
research.

Change-Id: I70cfd1f0a7c1db9c3da258aa570308d2eaa0d907
Signed-off-by: Paul Belanger <paul.belanger@polybeacon.com>
Merge "Bump file descriptors to 32768"