The current call uses the /domains end-point which lists all domains.
This only returns 100 domains at a time, so for long domain lists you
may not match and find the required ID.
Switch to using the search interface that only returns values matching
the requested domain. This will avoid missing results.
Reported by @jjamfd.
Closes: #2944
When running --updateaccount, the ca/<ca>/account.json file isn't
updated with the new response showing the updated account details.
This can be a bit confusing if you add an email to the account but
then you're not sure if it actually applied looking at this file.
Write out the new response on successful account updates.
