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gmultipath: add ATF tests

Add ATF tests for most gmultipath operations. Add some dtrace probes too,
primarily for configuration changes that happen in response to provider
errors.

PR: 178473
MFC a

gmultipath: add ATF tests

Add ATF tests for most gmultipath operations. Add some dtrace probes too,
primarily for configuration changes that happen in response to provider
errors.

PR: 178473
MFC after: 2 weeks
Sponsored by: Axcient
Differential Revision: https://reviews.freebsd.org/D22235

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