test/unit: remove unused method
test/unit: remove unused method

Change-Id: Idaf1ee2eb36cb1d60260187e16219365f7fbe756
Signed-off-by: MORITA Kazutaka <bbd3530b0f5f378e2b40164c99e36f2c5172a70e@gmail.com>

KoreaCloudObjectStorage/swift3,stackforge/swift3,swiftstack/swift3-stackforge,KoreaCloudObjectStorage/swift3,stackforge/swift3,tumf/swift3,swiftstack/swift3-stackforge,tumf/swift3