Dev: ra: Guess stonith class type when using fence agents

[liangxin1300]

Problem

When adding fence agent without giving stonith class, get an error while using Tab to get parameters

crm(live/alp-1)configure# primitive stonith-sbd fence_sbd params ERROR: ocf:heartbeat:fence_sbd: got no meta-data, does this RA exist?

That is allowed when adding ocf RA without giving ocf class

crm(live/alp-1)configure# primitive d Dummy params 
fake=    state=

Solution

In ra.disambiguate_ra_type function, return 'stonith' class type when RA starts with 'fence_'

[codecov]

Codecov Report

Attention: Patch coverage is 66.66667% with 1 line in your changes missing coverage. Please review.

Project coverage is 67.99%. Comparing base (c807292) to head (e9f9d42).
Report is 10 commits behind head on master.

Additional details and impacted files

Flag	Coverage Δ
integration	53.95% <66.66%> (+0.16%)	⬆️
unit	50.34% <66.66%> (+<0.01%)	⬆️

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Files	Coverage Δ
crmsh/ra.py	52.21% <66.66%> (-0.01%)	⬇️

... and 6 files with indirect coverage changes

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