OPENDJ-2701 Code cleanup

Refactor LDAPConnectionConsoleInteraction

* Split very long methods (run(), getKeyManagerInternal() and
getTrustManagerInternal()) in smaller ones, trying to keep the following
pattern for each parameter to resolve:
    1. Initialize the parameter value with command line (if present)
    2. Interactive prompt for the argument value (if the application is
interactive and the argument has not been given in the command line)
    3. Store the argument value in the CommandBuilder

* Make public fields private and create getters in
SecureConnectionCliArgs
* Other minor cleanup actions