Feature/bash completion

Hello, I was tired of writing things manually so I propose these bash-completion scripts for:
* rozo;
* exportd;
* storaged;
* rozofsmount.

Completion manages hostnames when it is needed.
Some *options* are fetched from '<command> -h' output (e.g. `rozofsmount -o`) which provides more details than the *man*, highlighting the lack of information in the *rozofsmount* man page.

Maybe bash detection should be set before deploying such scripts.