[LU-12131] Improve GSS/SSK handling in Lustre test suite

• Type: Bug
• Resolution: Fixed
• Priority: Minor
• Fix Version/s: Lustre 2.13.0, Lustre 2.12.3, Lustre 2.12.4
• Severity: 3
• Assignee: Sebastien Buisson
• Reporter: Sebastien Buisson

Description

The Lustre test suite can be improved for better testing of GSS/SSK features:

• since commit e299df1e9eeae5d20f3b8a544a5f4be4fd30872c for patch
  https://review.whamcloud.com/31317, lgssc.conf file is packaged by
  Lustre, and installed under /etc/request-key.d/. So the test framework must not create its own anymore;
• SSK can be activated by setting SHARED_KEY env variable to true. This variable and associated SK_MOUNTED env var are not consistent across all Lustre tests.

I will push patches to address these issues.