res_pjsip: Support setting a default accountcode on endpoints

Most channel drivers let you specify a default accountcode to be set on
channels associated with a particular peer/endpoint/object. Prior to this
patch, chan_pjsip/res_pjsip did not support such a setting.

This patch adds a new setting to the res_pjsip endpoint object, 'accountcode'.
When a channel is created that is associated with an endpoint with this value
set, the channel will automatically have its accountcode property set to the
value configured for the endpoint.

Review: https://reviewboard.asterisk.org/r/3724/

ASTERISK-24000 #close
Reported by: Matt Jordan
........

Merged revisions 418756 from http://svn.asterisk.org/svn/asterisk/branches/12


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@418757 65c4cc65-6c06-0410-ace0-fbb531ad65f3

contrib/ast-db-manage/config/versions/1d50859ed02e_create_accountcode.py

@@ -0,0 +1,20 @@
+"""create accountcode
+
+Revision ID: 1d50859ed02e
+Revises: 51f8cb66540e
+Create Date: 2014-07-07 21:07:01.661783
+
+"""
+
+# revision identifiers, used by Alembic.
+revision = '1d50859ed02e'
+down_revision = '51f8cb66540e'
+
+from alembic import op
+import sqlalchemy as sa
+
+def upgrade():
+    op.add_column('ps_endpoints', sa.Column('accountcode', sa.String(20)))
+
+def downgrade():
+    op.drop_column('ps_endpoints', 'accountcode')