Update default location for astdatadir for asterisk

This is needed because the centos packages install the sound files in a
different directory then the asterisk defaults too.

Change-Id: I97bd50439fad97906b3ee77a21672cc1114088c2
Signed-off-by: Paul Belanger <paul.belanger@polybeacon.com>
Merge "Update default location for astdatadir for asterisk"