certdb: remove unused keysize property

Keysize property is no longer used anywhere in the code. It was
originally introduced for the request_cert function, which was later
refactored to use a function argument instead.

Reviewed-By: Stanislav Laznicka <slaznick@redhat.com>
Reviewed-By: Fraser Tweedale <ftweedal@redhat.com>

ipaserver/install/certs.py

@@ -110,7 +110,6 @@ class CertDB(object):
 
         self.cacert_name = get_ca_nickname(self.realm)
         self.valid_months = "120"
-        self.keysize = "1024"
 
         # We are going to set the owner of all of the cert
         # files to the owner of the containing directory