Fix Alembic upgrades.

Fix Alembic upgrades.

A non-existent constraint was being referenced in the upgrade script.
This patch corrects the problem by removing the reference.

This patch fixes another realtime problem as well. Our Alembic scripts
store booleans as yes or no values. However, Sorcery tries to insert
"true" or "false" instead. This patch updates Sorcery to use "yes" and
"no"

ASTERISK-26128 #close

Change-Id: I366dbbf91418a9cb160b3ca74b0e59b5ac284bec