Delete obsolete directory properties
Include syslog_drain_url in service bindings

This is to ensure that the syslog_drain_url field will appear in
VCAP_SERVICES environment variable, as a previous refactoring has removed
this feature.

Also added integration test for User-Provided Service Instances

[finishes #60281112]
update bindings when updating a user provided service instance
Fail test suite if Sequel logs deprecation warning

[#59608656]
calling super to make sure all the timestamps are updated