Bug#398347: hooks should respect run-parts naming conventions

[dean gaudet <dean@arctic.org>]

Package: initramfs-tools
Version: 0.85a

the run_scripts() function should respect the same naming conventions as 
run-parts(8) ... in particular if my editor creates foo~, foo.bak, 
.foo.swp files run_scripts() will try to run them.  ditto for foo,v.

run_scripts() should also not attempt to invoke directories (i.e. RCS, 
CVS).

in particular i've run into troubles in the 
/usr/share/initramfs-tools/hooks directory... while trying to fix bugs in 
a hook i did "cp foo{,.orig}" so that i would be able to create a patch 
for upstream and ran into troubles because the foo.orig was executed as 
well.

i imagine there'll be .dpkg-old / .dpkg-dist /etc. troubles for hooks 
which are conffiles (which i'd hope most hooks would be).

-dean