Fix issue #356

[gberche-orange]

Now rejects update requests when the corresponding deployment is missing enable-deployment.yml marker.

cf update-service gberche-noop-x-osb-cmddb --upgrade
You are about to update gberche-noop-x-osb-cmddb.
Warning: This operation may be long running and will block further operations on the service until complete.
Really update service gberche-noop-x-osb-cmddb? [yN]: y
Updating service instance gberche-noop-x-osb-cmddb as gberche...
Service broker error: CF-ServiceBrokerRequestRejected(10001): Service broker error: Service instance does not exist: id=ba567621-3edb-4980-a498-9e204fab9ace
FAILED

and prints the following trace to hint operators

   2021-01-27T09:10:08.92+0100 [APP/PROC/WEB/0] OUT 2021-01-27 08:10:08.928  WARN 14 --- [nio-8080-exec-5] c.o.o.c.b.o.o.pipeline.BoshProcessor     : Enable-deployment is missing while receiving a request to update instance ba567621-3edb-4980-a498-9e204fab9ace Suspecting inconsistency from OSB client and COA deployment. Please check if manual cleanup was performed on coa deployments without going through CF (OSB client)