resolve: Pick manifest from configuration if not specified on the command line.

It is convenient when using ostbuild resolve manually instead of using
the autobuilder.
manifest: Convert tabs to space.

Cleanup, no functional changes.
manifest: Trying a patch from nezticle to fix the moc 'Undefined interface' error.

This patch is used by nezticle bsquask project for Raspberry Pi, should also work
on our yocto build.