Don't rely on `/sbin/ip` to fetch the docker bridge ip address, instead
first attempt to use the docker command to fetch it. If it fails, fall
back to previous behavior.
This includes updates for resolving all warnings provided by Ruby
for deprecations and/or removed methods. It also enables support
for Ruby 2.7 in the specification constraint as all 2.7 related
warnings are resolved with this changeset.
Prior to this commit, the docker compose build method would not properly
set build_args if given in a Vagrantfile. This commit fixes that by
using the passed in key `extra_args` from the docker build action.
Prior to this commit, the docker compose driver would _always_ path
expand a host volume no matter what. This is not always the correct
option, for example if that host volume is actually a reference to a key
inside a `volumes` hash instead of a path on disk. This commit changes
that by looking to see if the requested host volume is actually a
defined key inside the compose config, and if not, it will path expand
it like before. Otherwise it will leave the key "as is".
