account-server: Add test for leading delimiter
account-server: Add test for leading delimiter

Related-Change: I27701a31bfa22842c272b7781738e8c546b82cbc
Related-Change: If912f71d8b0d03369680374e8233da85d8d38f85
Change-Id: I0c850b8ae40d1ab477d0f5d18f92579c457da54e
Related-Bug: 1475018

openstack/swift,tipabu/swift,tipabu/swift,openstack/swift,tipabu/swift,swiftstack/swift,tipabu/swift,swiftstack/swift,swiftstack/swift,openstack/swift,openstack/swift