Merge branch 'fix-juniper-generator-labels' into 'master'

Juniper.JUNOS.get_metrics. Fix labels format on slot generator.

See merge request !6850

(cherry picked from commit bf6d8a0d)

c8849e14 Juniper.JUNOS.get_metrics. Fix labels format on slot generator.
cdb87536 Fix black.
6 jobs for !6851 with cherry-pick-bf6d8a0d in 15 minutes and 2 seconds (queued for 7 seconds)
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