provider/azure: fix create-model
provider/azure: fix create-model

Add endpoint and storage-endpoint to,
and remove credentials and storage
account type from, restricted config
attributes.

Fixes https://bugs.launchpad.net/juju-core/+bug/1558769

perrito666/juju,AdamIsrael/juju,frankban/juju,perrito666/juju,bz2/juju,gabriel-samfira/juju,waigani/juju,mikemccracken/juju,bogdanteleaga/juju,alesstimec/juju,gabriel-samfira/juju,axw/juju,dimitern/juju,dooferlad/juju,kat-co/juju,makyo/juju,waigani/juju,axw/juju,bac/juju,reedobrien/juju,dimitern/juju,mikemccracken/juju,ericsnowcurrently/juju,anastasiamac/juju,bz2/juju,mjs/juju,bac/juju,dooferlad/juju,alesstimec/juju,ericsnowcurrently/juju,kat-co/juju,bogdanteleaga/juju,makyo/juju,reedobrien/juju,perrito666/juju,macgreagoir/juju,AdamIsrael/juju,alesstimec/juju,makyo/juju,frankban/juju,reedobrien/juju,perrito666/juju,alesstimec/juju,ericsnowcurrently/juju,mjs/juju,waigani/juju,mjs/juju,anastasiamac/juju,howbazaar/juju,ericsnowcurrently/juju,mjs/juju,reedobrien/juju,frankban/juju,macgreagoir/juju,AdamIsrael/juju,bac/juju,dooferlad/juju,frankban/juju,mjs/juju,mjs/juju,marcmolla/juju,dooferlad/juju,bac/juju,bz2/juju,howbazaar/juju,axw/juju,mikemccracken/juju,marcmolla/juju,frankban/juju,ericsnowcurrently/juju,macgreagoir/juju,bz2/juju,macgreagoir/juju,mjs/juju,alesstimec/juju,howbazaar/juju,gabriel-samfira/juju,makyo/juju,AdamIsrael/juju,anastasiamac/juju,gabriel-samfira/juju,bogdanteleaga/juju,mikemccracken/juju,dimitern/juju,howbazaar/juju,anastasiamac/juju,waigani/juju,marcmolla/juju,anastasiamac/juju,kat-co/juju,bogdanteleaga/juju,macgreagoir/juju,marcmolla/juju,kat-co/juju,howbazaar/juju,mikemccracken/juju,marcmolla/juju,perrito666/juju,axw/juju,dimitern/juju,dooferlad/juju,reedobrien/juju,kat-co/juju,bac/juju,axw/juju,dimitern/juju,gabriel-samfira/juju,bz2/juju