bee-sysconf: Add new tool to manage pkg sysconf-files

sysconf-files are the files located in a packages PKG_SYSCONFDIR.

All sysconf-files of a package are installed to the directory
BEE_METADIR/PKGALLPKG/bee-sysconf

bee sysconf is used to mange those files

This is the initial version of bee-sysconf which only supports

bee sysconf install --force PKGALLPKG

to be able to integrate sysconf changes without breaking anything.
bee-sysconf/bee-install: Install PKG_SYSCONFDIR files in BEE_METADIR

This patch prepares bee-install to be used with the new bee-sysconf
tool. PKG_SYSCONFDIR is trandformed during installation to be installed
to BEE_METADIR/PKGALLPKG/bee-sysconf/*.

If PKG_SYSCONFDIR is not set in META file or is empty nothing happens.
bee-install: Add function to wrap bee-sysconf to increase readability