[18.09] backport fix insecure manifest inspect with restrictive certs perms #1382
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Backport of #1378 for 18.09
If, for some reason, the certs directory has permissions that are
inaccessible by docker, we should still be able to fetch manifests using
the
insecure
flag.Since the cli doesn't access the engine's list of insecure registries,
the registry client should make a singleton list of the registry being queried with the
insecure
flag.Closes #1358