opscenter 5.0.1 (new formula)

Provides a new formula to install version 5.0.1 (currently the latest version) of DataStax OpsCenter
Can a test be added to do something more substantial than e.g. `--version` or `--help`? See `cmake.rb` for an example of an application formula with a good test and `tinyxml2.rb` for an example of a library formula with a good test. Thanks!