CORE-1815 Liquibase SDK command to easily watch database

Improved handling of empty and missing changelog file
changeLogSync listener
CORE-1824 GUID Default values not quoted correctly in MSSQL
CORE-1825 Snapshot does not capture foreign keys referencing unique constraints

CORE-1635 Generated changelog missing unique constraints should be output before foreign keys
Merge branch 'master' into LB-3.1-testing