Fix integration tests

[kwessel]

• Add LDAP Dockerfile to replace missing DockerHub image.
• Fix failing V2 integration test.

Closes #261

[edthedev]

I have moved this into 'Engagements' in our board, as we plan to get together with @kwessel to collaborate on this, likely next week.

[edthedev]

I think I parsed the key message out of yesterday's remaining test failure:

# -- no output line contains substring --
# substring : aws: error: argument command: Invalid choice
# output (14 lines):
#   No AWS region has been configured. The AWS region is the geographic location of your AWS resources.

Basically, we are expecting our own custom failure message, but we don't get there because AWS wants more configuration.

Probably a behavior change in AWS CLI.