MT#7955 Grant some rights to asterisk user

Allow to select subscriber and dbaliases tables to find the
right mailbox for any alias.

db_scripts/diff/15083.up

@@ -0,0 +1,4 @@
+use provisioning;
+
+grant select on provisioning.voip_subscribers to "asterisk"@"localhost";
+grant select on provisioning.voip_dbaliases to "asterisk"@"localhost";