Various fixes (opa property, creation of deploy and besteffort, cosmetic stuff)

Several commits to fix various issues in the OAR properties generator:

• bug 11245 https://intranet.grid5000.fr/bugzilla/show_bug.cgi?id=11245
• bug 11352 https://intranet.grid5000.fr/bugzilla/show_bug.cgi?id=11352
• bug 10705 https://intranet.grid5000.fr/bugzilla/show_bug.cgi?id=10705

changed the description

changed title from Various fixes to Various fixes (opa property, creation of deploy and besteffort, cosmetic stuff)

assigned to @neyron

changed the description

added 10 commits

• 1e118cef...8dd84281 - 4 commits from branch master
• 5bfc9260 - [gen/oar-properties] introduce a list of OAR system properties that should not be added
• e470bfed - [gen/oar-properties] Use Integer instead of Fixnum to avoid a warning on recent Ruby versions
• 4b724830 - [gen/oar-properties] close SSH connection to avoid an error message
• 21bf6b40 - [gitlab-ci] add rspec tests
• 1568659f - [gen/oar-properties] remove useless comments
• 555e2643 - remove OPA property

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merged

mentioned in commit a26c7e9b