Make api.env.mode consistent
    
    * use "developer" in Azure
    * fix man page: "development" to "developer"
    * list known modes in API bootstrap methods
    
    Other values for mode are still supported to avoid breaking existing
    installations.
    
    Fixes: https://pagure.io/freeipa/issue/8313
    Signed-off-by: Christian Heimes <cheimes@redhat.com>
    Reviewed-By: Rob Crittenden <rcritten@redhat.com>