Add certificate to a user provides invalid hint

[flo-renaud]

When issuing a certificate to a user (with Identity > Users > Active Users > User > : New Certificate), the dialog provides an invalid hint:

# certutil -R -d ~/certdb/ -a -g 4096 -s 'CN=server.webui.test,O=IPA.TEST'

Since the user is 'idmuser' it should print -s CN=idmuser,O=IPA.TEST

The box for the CSR should also print 'Paste certificate request here' instead of 'Paste certificate here'

Same comment when adding a certificate for a host (should use the hostname, not the server name) or a service.

[carma12]

Probably this value was hardcoded at the very beginning and was not updated anymore. Luckily, this is easy to fix.