Need to support new linux capability AUDIT_READ

Docker-DCO-1.1-Signed-off-by: Dan Walsh <dwalsh@redhat.com> (github: rhatdan)

contrib/completion/bash/docker

@@ -131,6 +131,7 @@ __docker_capabilities() {
 		ALL
 		AUDIT_CONTROL
 		AUDIT_WRITE
+		AUDIT_READ
 		BLOCK_SUSPEND
 		CHOWN
 		DAC_OVERRIDE