Add test_smoke test re-open

[BON4]

Issue #441

This pull request is re-open of pull request that was closed by me due to CLA check fix.

All this cases should be covered:

• Test Application. VM resources is removed after application removal. Install app, remove app (removal test), check no garbage left.
• Test Unit. Re-Installation. Remove unit with --force --no-wait, storage should be detached.
• Test Unit. Garbage ignorance. Charm should deploy in dirty environment with garbage storage.
• Test Application. Application should deploy in dirty environment with garbage storage from another application.

[dragomirp]

Hi, @BON4, please fix the linting errors.

[taurus-forever]

LGTM, Thank you!

P.S. checking the test output and this line looks suspicious:

unit-postgresql-test-app-1: 12:00:55 ERROR unit.postgresql-test-app/1.juju-log upgrade:0: Failed to list PostgreSQL database users: could not translate host name "None" to address: Temporary failure in name resolution

Is PostgreSQL charm returns None as a hostname in relation? I worth a question in Matrix at least... maybe even bugreport if true.

[taurus-forever]

@marceloneppel can we merge this? P.S. Tests finally happy! \o/