Refactor command line processing

[acogoluegnes]

Adding a new command line option needs to edit the PerfTest class in several places. Options could refactored as links of a chain of responsabilities, modifying a context (the ConnectionFactory, the SSLContext, etc). Adding a new command would a matter of adding a new link (a class or a instance of some sort). Checks could also be done, to avoid e.g. duplicates.