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Lets not use beta release anymore, since we have a stable version
available now.

The newer version doesn't support Yamls anymore, but rather another
feature "derive", which is quite easy to use actually. Lets migrate to
it.

Some of the tests can't be done anymore, drop them.
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>

Signed-off-by: Sergii Glushchenko <gsserge@amazon.com>

Add more tests to increase coverage.
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>

For tests we can pass a non related vring to just make it run, hence no
need of making it optional. Always pass the vring.
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>

The i2c crate now uses log crate to publish error, info and warn
messages, but doesn't initialize a logger yet and these messages never
make it out.

Initialize the env_logger to see these messages.
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>

Update version of other dependencies and fix minor build issues.
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>

The workspace section in Rust documentation suggests adding new crates
in the top level directory itself instead of the src folder. Remove the
top level src folder.
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>