Merge topic 'alembic_fixes' into 13

* changes:
  Alembic: Increase column size of PJSIP AOR "contact".
  Alembic: Add PJSIP global keep_alive_interval.

contrib/ast-db-manage/config/versions/189a235b3fd7_add_keep_alive_interval.py

@@ -0,0 +1,22 @@
+"""add_keep_alive_interval
+
+Revision ID: 189a235b3fd7
+Revises: 28ce1e718f05
+Create Date: 2015-12-16 11:23:16.994523
+
+"""
+
+# revision identifiers, used by Alembic.
+revision = '189a235b3fd7'
+down_revision = '28ce1e718f05'
+
+from alembic import op
+import sqlalchemy as sa
+
+
+def upgrade():
+    op.add_column('ps_globals', sa.Column('keep_alive_interval', sa.Integer))
+
+
+def downgrade():
+    op.drop_column('ps_globals', 'keep_alive_interval')

contrib/ast-db-manage/config/versions/2d078ec071b7_increaes_contact_column_size.py

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+"""increaes_contact_column_size
+
+Revision ID: 2d078ec071b7
+Revises: 189a235b3fd7
+Create Date: 2015-12-16 11:26:54.218985
+
+"""
+
+# revision identifiers, used by Alembic.
+revision = '2d078ec071b7'
+down_revision = '189a235b3fd7'
+
+from alembic import op
+import sqlalchemy as sa
+
+
+def upgrade():
+    op.alter_column('ps_aors', 'contact', type_=sa.String(255))
+
+
+def downgrade():
+    op.alter_column('ps_aors', 'contact', type_=sa.String(40))