Fix integration test for service command
Fix integration test for service command

The previous change did not account for the spaces that are displayed
after `service broker:` in the output. `\s+` remains non-viable because
`Say` greedily regex-matches on the remaining contents of the buffer, rather than
individual output lines.

[#163053277]

Co-authored-by: Tom Viehman <ef9e7682e71c138189ac51545830b782ff2b8b7d@pivotal.io>

cloudfoundry/cli,cloudfoundry/cli,cloudfoundry/cli