fix common name on cert creation

[bennomadic]

Having only the username in the cert makes it confusing for the user:
when she has to pick from the cert selection UI there's nothing that helps to choose the
proper cert for a given site.

We could:
a) introduce site url in the cert CN --> ben [webid.rhizolab.org]
b) change Issuer name ("not a certification authority")
c) let user choose the name that will be displayed (in advanced view, perhaps?)

[domguard]

a) is a good idea +1

Introducing a timestamp could help to make a difference when you have created more than one key on the same provider too :

ID FOAF+SSL de dom [0D]
ID FOAF+SSL de dom [0C]

BTW who made this name "ID FOAF+SSL de dom" (in french) ? Firefox ?

A linked question : is it possible (I suppose "no" as it is installed in the browser) to update this name when, for example the certificate is revoked ?