Remove enviornment varialbes refs (base_dir & WORKSPACE)

[yfried]

KCLI and khaleesi should work without any environment variables.

• Right now, there are several references in khaleesi to base_dir (see playbooks/collect_logs).
• settings defines base_dir value as $WORKSPACE
• ksgen is setting WORKSPACE="../"

This is wrong because:

1. This env var exists only in Jenkins
2. Users working with CLI don't expect to have to define envars to make it work
3. Khaleesi shouldn't rely on anything outside of its own working directory.