'udevinfo' no longer seems to be available across various
distros. 'udevadm' seems to be the currently valid way to look up the
'udev' version.

Tested on:
Gentoo Linux
Debian 6.0.10
Oracle Linux Server release 7.1

Rely on regex to find the version number, rather than rely on numerical input to be found in a particular input field.
Proposed implementation also eliminates the necessity to invoke 'grep' + 'awk'.
Signed-off-by: NAlexander Kapshuk <alexander.kapshuk@gmail.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>