res_pjsip: improve realtime performance

This patch modified pjsip_options to retrieve only
permament contacts for aor if the qualify_frequency is > 0
and persisted contacts if the qualify_frequency is > 0.

This patch also fixed a bug in res_sorcery_astdb.
res_sorcery_astdb doesn't save object data retrived from astdb.

ASTERISK-25826

Change-Id: I1831fa46c4578eae5a3e574ee3362fddf08a1f05

contrib/ast-db-manage/config/versions/837aa67461fb_ps_contacts_add_authenticate_qualify.py

@@ -0,0 +1,32 @@
+"""ps_contacts add authenticate_qualify
+
+Revision ID: 6be31516058d
+Revises: 81b01a191a46
+Create Date: 2016-05-03 14:57:12.538179
+
+"""
+
+# revision identifiers, used by Alembic.
+revision = '6be31516058d'
+down_revision = '81b01a191a46'
+
+from alembic import op
+import sqlalchemy as sa
+from sqlalchemy.dialects.postgresql import ENUM
+
+YESNO_NAME = 'yesno_values'
+YESNO_VALUES = ['yes', 'no']
+
+def upgrade():
+    ############################# Enums ##############################
+
+    # yesno_values have already been created, so use postgres enum object
+    # type to get around "already created" issue - works okay with mysql
+    yesno_values = ENUM(*YESNO_VALUES, name=YESNO_NAME, create_type=False)
+
+    op.add_column('ps_contacts', sa.Column('authenticate_qualify', yesno_values))
+
+
+def downgrade():
+    op.drop_column('ps_contacts', 'authenticate_qualify')
+