test_zpm: group tests for _deploy_zapp
test_zpm: group tests for _deploy_zapp

This groups all of the tests for zpmlib.zpm._deploy_zapp into the same
test class. This is for better consistency and so we don't have related
tests scattered everywhere.

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