Loop through valid kboot conf names

Loop through valid kboot conf names

The PS3 bootloader spec allows several kboot.conf file names.
Add a loop in the parser to check for all of them.

Also, print some diagnostic messages to the log file and change
the parser routine name from 'parser' to 'kboot_parser'
to give a better log file output.

Signed-off-by: Geoff Levand <geoffrey.levand@am.sony.com>