mount-boot.eclass: Check if /boot is sane, but don't try to mount it.

The eclass failed to remount a read-only mounted /boot, because package
collision sanity checks in recent Portage versions prevented it from
reaching pkg_preinst() at all. Furthermore, with the "mount-sandbox"
feature enabled, the mount won't be propagated past pkg_preinst() and
installed files would end up under the (shadowed) mount point.

Therefore don't even attempt to mount /boot ourselves, but error out
if it isn't mounted read/write and ask the user to mount /boot.

Also clean up and simplify. (For example, awk is a grown-up program
which doesn't need any help from egrep or sed. :-)

Closes: https://bugs.gentoo.org/532264
See-also: https://bugs.gentoo.org/274130#c5
Acked-by: Jaco Kroon <jaco@uls.co.za>
Signed-off-by: Ulrich Müller <ulm@gentoo.org>

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