Increase the timeout waiting for certificate issuance in installer
    
    During the server installation, the installer requests certificates
    through certmonger. The current timeout is 60s and is too low.
    Increase this timeout to api.env.startup_timeout as done in
    ipa_cacert_manage or ipa_certupdate.py
    (the code checks the status each 5s up to the timeout value).
    
    https://fedorahosted.org/freeipa/ticket/6433
    
    Reviewed-By: Martin Basti <mbasti@redhat.com>
    Reviewed-By: Martin Babinsky <mbabinsk@redhat.com>