Support template unittesting through controlled failure of compilations

[stdweird]

Support controlled pan compilation failure through ProfileCache prepare_profile_cache method. This allows unittesting of failing pan templates (eg to unittest intentional compilation failures due to schema violation).

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[stdweird]

@jrha i think last commit closes another (hopefully last) possible path that can lead to a racecondition and the DESTROY failures of the unittests

[stdweird]

retest this please

[stdweird]

test this please

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[stdweird]

test this please

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[jrha]

@stdweird — I'm happy to merge this when the PR has a suitable bit of text explaining what this is and why it's needed. :smile_cat:

[stdweird]

@jrha i thought the original "Text explaining what this means goes here." was clear enough :smile:

[jrha]

Thanks. Does this also fix quattor/configuration-modules-core#432?

[stdweird]

@jrha remains to be seen, but very likely.

[jrha]

Ok cool

[jouvin]

I propose to merge this PR now in order to produce a new release. @jhra, anything against merging?