combo-layer: exclude files

Some combined repos intentionally do not include certain files.
For example, Poky does not include bitbake's setup files and
OE-core's sample files under meta/conf.

When these files get modified in the upstream repository, applying the
patches fails and requires manual intervention. That is merely a
nuisance for someone familiar with the problem, but a real show
stopper when having the import run automatically or by someone less
experienced.

Therefore this change introduces "file_exclude", a new per-repo list
of file patterns which removes all matching files when initializing or
updating a combined repository. Because fnmatch is used under the hood
to match full path strings, removing entire directories must be done
with a pattern ending in a '/*' (in contrast to file_filter).

For Poky, the additional configuration looks like this:

[bitbake]
...
file_exclude = classes/base.bbclass
	conf/bitbake.conf
	.gitignore
	MANIFEST.in
	setup.py
	TODO

[openembedded-core]
...
file_exclude = meta/conf/bblayers.conf.sample
	meta/conf/local.conf.sample
	meta/conf/local.conf.sample.extended
	meta/conf/site.conf.sample

Signed-off-by: Patrick Ohly <patrick.ohly@intel.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>

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