This change makes it so we only try to mount 'auto' when cdroot is specified. This...

This change makes it so we only try to mount 'auto' when cdroot is specified.  This should fix all of our mounting issues, as well as allow for not only USB keys to use these kernels with a LiveCD kernel/config, but allow it to boot from any media which the kernel has support.

git-svn-id: svn+ssh://svn.gentoo.org/var/svnroot/genkernel/trunk@442 67a159dc-881f-0410-a524-ba9dfbe2cb84