vdev_id: improve keyword parsing flexibility

The vdev_id udev helper strictly requires configuration file keywords
to always be anchored at the beginning of the line and to be followed
by a space character.  However, users may prefer to use indentation or
tab delimitation.  Improve flexibility by simply requiring a keyword
to be the first field on the line.

Signed-off-by: Brian Behlendorf <[email protected]>
Closes #1239

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