res_pjsip: Config option to enable PJSIP logger at load time.

Added a "debug" configuration option for res_pjsip that when set to "yes"
enables SIP messages to be logged.  It is specified under the "system" type.
Also added an alembic script to add the option to realtime.

(closes issue ASTERISK-23038)
Reported by: Rusty Newton
Review: https://reviewboard.asterisk.org/r/3148/
........

Merged revisions 407036 from http://svn.asterisk.org/svn/asterisk/branches/12


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@407037 65c4cc65-6c06-0410-ace0-fbb531ad65f3

contrib/ast-db-manage/config/versions/21e526ad3040_add_pjsip_debug_option.py

@@ -0,0 +1,21 @@
+"""add pjsip debug option
+
+Revision ID: 21e526ad3040
+Revises: 2fc7930b41b3
+Create Date: 2014-01-30 10:44:02.297455
+
+"""
+
+# revision identifiers, used by Alembic.
+revision = '21e526ad3040'
+down_revision = '2fc7930b41b3'
+
+from alembic import op
+import sqlalchemy as sa
+
+
+def upgrade():
+    op.add_column('ps_globals', sa.Column('debug', sa.String(40)))
+
+def downgrade():
+    op.drop_column('ps_globals', 'debug')