K 10
svn:author
V 7
asomers
K 8
svn:date
V 27
2019-12-06T00:12:14.157920Z
K 7
svn:log
V 293
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

END