[lvm-devel] [PATCH] Fix 'make check' to work with the latest device-mapper

[Jun'ichi Nomura]

Fix 'make check' runnable with recent versions of dmsetup.

'make check' uses DM_DEV_DIR environment variable to set
a sandbox for testing.
To confirm if dmsetup command supports the variable,
it checks the error message of dmsetup when invalid value is set to
the variable.

As the message of dmsetup has recently changed, 'make check'
should test for the newe version, too.
Otherwise, it skips all tests that includes activation.

Thanks,
-- 
Jun'ichi Nomura, NEC Corporation of America
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