mssql.tsql_query: add autocommit connection option

[LukeCarrier]

What does this PR do?

When making schema changes (e.g. ALTER DATABASE) we need to configure the connection such that the driver manages committing changes, e.g.:

mssql.database.create:
  mssql.db_create:
    - name: mydb

mssql.database.alter:
  mssql.tsql_query:
    - name: ALTER mydb COLLATE Latin1_General_CS_AS
    - autocommit: True

Without autocommit enabled we'll receive a pymssql.OperationalError like the following:

(226, 'ALTER DATABASE statement not allowed within multi-
statement transaction.DB-Lib error message 226, severity 16:\\nGeneral SQL Serve
r error: Check messages from the SQL Server\\n')

What issues does this PR fix or reference?

None

Tests written?

No -- develop doesn't seem to contain any tests for this module.

Commits signed with GPG?

No

[LukeCarrier]

Cheers @cachedout!