Don't attach private data dir to the bwrap environment

[matburt]

I'm thinking this may not be needed to have accessible by the bwrap environment running the playbook, and it's already available to the Runner process itself

This should wrap up #4010

[softwarefactory-project-zuul]

Build failed.

• awx-api-lint : SUCCESS in 8m 19s
• awx-ui-lint : SUCCESS in 9m 19s
• awx-api : FAILURE in 12m 04s
• awx-ui : SUCCESS in 10m 23s
• awx-swagger : SUCCESS in 12m 08s
• awx-detect-schema-change : SUCCESS in 12m 36s (non-voting)

[AlanCoding]

Sometimes cwd is the private_data_dir, so those cases would see the same problem.

In #4001 (which will be in the final feature), we have to move the working directory from the project folder (which contains the playbook) to the project copy, which is in the private_data_dir.

Like I was doing there, I think you need to compare if the cwd either is the private data dir, or is a subdirectory of it, and if it is, you need to remove cwd as well.

[matburt]

In that case, AWX itself will have to be the one to remove the private_data_dir as that's one of the key things that runner assumes will hang around for a while. That case is also mostly true for the artifact directory

[matburt]

I need to think about this one more.