commands: check if the chrooted resolv.conf is a symlink
commands: check if the chrooted resolv.conf is a symlink

If the resolv.conf in chrooted environment changed to symlink and point to
non-existing file, the os.Stat() fail the check of file existence.
Use os.Lstat() call instead and add additional checks during the resolv.conf
restore phase.

Fixes: #190

Signed-off-by: Denis Pynkin <3fbf95ee68899518ee8799d35f88c8f7982aa936@collabora.com>

go-debos/debos