ZTS: Re-enable MMP tests

Commit 7fab6361 inadvertently disabled the MMP test cases by creating
and not removing an /etc/hostid file in the new zpool_split_props test
case.  When the file exists the ZTS skips the entire MMP test group
rather than modify what may be a system which is already configured.
Update the test case to remove the file.

Additionally, because the MMP tests were disabled a regression slipped
in as part of commit 9eb7b46ed0.  Fix it.

Reviewed-by: Tim Chase <[email protected]>
Reviewed-by: Giuseppe Di Natale <[email protected]>
Reviewed-by: loli10K <[email protected]>
Signed-off-by: Brian Behlendorf <[email protected]>
Closes #7514 

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