res_pjsip: improve realtime performance #2

The patch removes updating all Endpoints' status on startup.
Instead, only non-qualified aors with static contact
and non-qualified non-expired contacts are retrieved from the realtime to
update the endpoint status to ONLINE.
The endpoint name was added to the contact object to simply find the endpoint
that created this contact.

The status of endpoints with qualified aors will be updated by 'qualify'
functions.

ASTERISK-26061 #close

Change-Id: Id324c1776fa55d3741e0c5457ecac0304cb1a0df

contrib/ast-db-manage/config/versions/ef7efc2d3964_ps_contacts_add_endpoint_and_modify_.py

@@ -0,0 +1,33 @@
+"""ps_contacts add endpoint and modify expiration_time to bigint
+
+Revision ID: ef7efc2d3964
+Revises: a845e4d8ade8
+Create Date: 2016-06-02 18:18:46.231920
+
+"""
+
+# revision identifiers, used by Alembic.
+revision = 'ef7efc2d3964'
+down_revision = 'a845e4d8ade8'
+
+from alembic import op
+import sqlalchemy as sa
+
+
+def upgrade():
+    context = op.get_context()
+
+    op.add_column('ps_contacts', sa.Column('endpoint', sa.String(40)))
+
+    if context.bind.dialect.name != 'postgresql':
+        op.alter_column('ps_contacts', 'expiration_time', type_=sa.BigInteger)
+    else:
+        op.execute('ALTER TABLE ps_contacts ALTER COLUMN expiration_time TYPE BIGINT USING expiration_time::bigint')
+
+    op.create_index('ps_contacts_qualifyfreq_exptime', 'ps_contacts', ['qualify_frequency', 'expiration_time'])
+    op.create_index('ps_aors_qualifyfreq_contact', 'ps_aors', ['qualify_frequency', 'contact'])
+def downgrade():
+    op.drop_index('ps_aors_qualifyfreq_contact')
+    op.drop_index('ps_contacts_qualifyfreq_exptime')
+    op.drop_column('ps_contacts', 'endpoint')
+    op.alter_column('ps_contacts', 'expiration_time', type_=sa.String(40))