pkcs10: remove pyasn1 PKCS #10 spec
In the dogtag-ipa-ca-renew-agent-submit certmonger renewal helper,
we currently use our hand-rolled PKCS #10 pyasn1 specification to
parse the friendlyName out of CSRs generated by certmonger (it
contains the NSSDB nickname of the cert).
Use other information from the renewal helper process environment to
determine the nickname and remove our PKCS #10 pyasn1 spec.
Part of: https://fedorahosted.org/freeipa/ticket/6398
Reviewed-By: Jan Cholasta <jcholast@redhat.com>
Reviewed-By: Florence Blanc-Renaud <frenaud@redhat.com>