tox: generate JUnit XML report too
tox: generate JUnit XML report too

The "cover" tox environment was renamed to "full" to better reflect
that this is the test environment that will do full (extensive)
testing.

zerovm/zpm,zerovm/zpm,zerovm/zerovm-cli,zerovm/zerovm-cli,zerovm/zerovm-cli,zerovm/zerovm-cli,zerovm/zpm,zerovm/zpm,zerovm/zpm,zerovm/zerovm-cli,zerovm/zpm,zerovm/zerovm-cli