Changes

asterisk: pjsip.conf: Mark templates accordingly

Mark templates as such, in order to remove error messages during
asterisk setup when trying to apply the templates (which lack fields
such as "username", provided by config sections using the templates).

Reference: https://docs.asterisk.org/Fundamentals/Asterisk-Configuration/Asterisk-Configuration-Files/Templates/Template-Syntax/

Change-Id: Ia132c2e90cf6ee44145ca2e2555cf2dc6c1cfd51

asterisk: manager.conf: Give more permissions to AMI user

These are required to use eg. PJSIPRegister command, otherwise Asterisk
answers with "Permission Denied".

It also seems to help in getting more events from Asterisk.

Change-Id: Ia77a9d88758f648a5539dbc7511b75c20fe7dd6b