bob bio pipelines vanilla-biometrics is a bad name

This command line has a terrible name and there are several issues with it:

• It's too long!
• It has both bio and biometrics in its name, which point to the same thing
• The biometrics part matches with metrics. So every time in bash, I try to run the last bob bio metrics command, I type metrics in my search and instead I get this command.
• I cannot use the shorthand name of this command, i.e. typing bob bio pip vanil atnt arcface, because it matches this command and the vanilla-biometrics-score-normalization command.

I suggest renaming both this command and the score normalization one to:

$ bob bio pipeline vanilla
$ bob bio pipeline score-norm