* Remove unnecessary account ID match check.
Right now the Account object calculates an ID using md5. This is
unnecessary and causes problems on FIPS systems that forbid md5. It's
just as good to pick a random series of bytes for the ID, since the ID
gets read out of renewal/foo.conf.
However, if we switched the algorithm right now, we could wind up
breaking forward compatibility / downgradeability, since older versions
would run into this check.
Removing this check now lays the ground to change the ID-calculation
algorithm in the future.
Related to #1948 and
https://github.com/certbot/certbot/pull/1013#issuecomment-149983479.
* Remove test.
* Remove unused import.
3608abb01a