Improve the usability of pack selection dialogue in console installation

We should fix the usability of pack selection dialogue in console installation. If I run the gui installation I can clearly see what packs are to be installed byt default (eap-core without picketlink and docs), but I cannot get this information from console installation (no default values).

We should either change the dialogue to be like it is in EAP 6.2 installer or at least fix the form of options from:

[eap-core]  [y/n]

to:

[eap-core]  (y/n) [y]

so it's clear what option will be selected by default (pressing just a enter key without any other input).