storagedriver/s3: Added Delete tests to s3_test
storagedriver/s3: Added Delete tests to s3_test

(cherry picked from commit 1e3b6b67a8e6d7f01307518370f0731212935d05)
Signed-off-by: Collin Shoop <9630196f04a576060ab1de02adc56567730c4ce8@digitalocean.com>

thaJeztah/distribution,docker/distribution,docker/distribution,thaJeztah/distribution