OBMFULL-5714 Don't eat the company_id field.

It doesn't taste good.
OBMFULL-5714 Indexes company AKA.
OBMFULL-5714 Adds contact_company_id migration.

Since OBM mistakenly did not set the contact_company_id correctly, add two
migrations to fill it correctly.
OBMFULL-5714 Indexes company AKA in obm_index_init.