Skip cross-account-copy functest if only one account
Skip cross-account-copy functest if only one account

This looks like a case of copy-paste-itis. The cross-account-copy
functest is skipped if we have no test accounts configured, but not if
we have only one.

Change-Id: Ifbefdd9aeb98e3d02c536e9d29759f86ec9af6a1

tipabu/swift,nadeemsyed/swift,swiftstack/swift,nadeemsyed/swift,smerritt/swift,matthewoliver/swift,openstack/swift,matthewoliver/swift,tipabu/swift,smerritt/swift,openstack/swift,swiftstack/swift,openstack/swift,matthewoliver/swift,nadeemsyed/swift,tipabu/swift,matthewoliver/swift,smerritt/swift,openstack/swift,nadeemsyed/swift,tipabu/swift,smerritt/swift,swiftstack/swift