New test to allow testing an arbitrary liquibase script

The test can be executed from the command line via:
mvn clean test -Ddb.url="jdbc:mysql://localhost:3306/<database>?autoReconnect=true" -Ddb.user='<user>' -Ddb.password='<pass>' -Dscript.file="<path to script>" -Dopenmrs.version="1.9.0" -Dtest=UpgradeScriptTest -DfailIfNoTests=false