[PSST] New test -- singularity validation

[bbockelm]

We should copy the singularity validation test from SAM or the pilot. Would see if there is a functional isolation mechanism on the worker node.

[roksys]

Currently there is a default glexec validation from glideinWMS side and it seems to be running according CMS frontend configuration.
As far as I understood, it runs if GLEXEC_BIN attribute in the factory entry is set.

Do we need to duplicate this test? Do we need some information from this test to be reported to ES?

[bbockelm]

Knowing whether there is functioning isolation is pretty important.

Is it possible to just get the result from the Singularity / glexec test and advertise it in ES?

[roksys]

Default glideinWMS glexec setup script runs after custom scripts. So I can't get result of it.
I need to find other way as I want to avoid duplicating tests.

I can add singularity validation script to PSST or just take value from HAS_SINGULARITY.

[bbockelm]

Let's just take the value from HAS_SINGULARITY - we can add glexec test support later.

[roksys]

plot - singularity vs no singularity