basic-cfg: asterisk.conf: debug level 5 spams

Don't suggest users to use debug level 5, which spews (usually
non-useful) debug information. Reduce the suggestion to (an
arbitrarily-selected) level 2.

Change-Id: Ib53195f78945970956ff59ef13fa89b90e0fcd60
Signed-off-by: Tzafrir Cohen <tzafrir.cohen@xorcom.com>

configs/basic-pbx/asterisk.conf

@@ -15,7 +15,7 @@ astsbindir => /usr/sbin
 ; If we want to start Asterisk with a default verbosity for the verbose
 ; or debug logger channel types, then we use these settings.
 ;verbose = 5
-;debug = 5
+;debug = 2
 
 ; User and group to run asterisk as. NOTE: This will require changes to
 ; directory and device permissions.