package/docker-proxy: bump version to 55685ba49593

Which is the version used by docker 18.09.9:

https://github.com/docker/engine/commit/0a3767c7e9803f0a595a07b0548e99d60e861062

Also add a hash for the license file.

Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
(cherry picked from commit 02e2fe2eca632e7ca2058d4861f5d49e6b5ba608)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/docker-proxy/docker-proxy.hash

@@ -1,2 +1,3 @@
 # Locally calculated
-sha256	2eee331b6ded567a36e7db708405b34032b93938682cf049025f48b96d755bf6	docker-proxy-7b2b1feb1de4817d522cc372af149ff48d25028e.tar.gz
+sha256	866c8d196b9396a383b437b0d775476459ed7c11f527c4f6bbf1fd08524b461d	docker-proxy-55685ba49593e67f5e1c8180539379b16736c25e.tar.gz
+sha256  cb5e8e7e5f4a3988e1063c142c60dc2df75605f4c46515e776e3aca6df976e14	LICENSE

package/docker-proxy/docker-proxy.mk

@@ -4,7 +4,7 @@
 #
 ################################################################################
 
-DOCKER_PROXY_VERSION = 7b2b1feb1de4817d522cc372af149ff48d25028e
+DOCKER_PROXY_VERSION = 55685ba49593e67f5e1c8180539379b16736c25e
 DOCKER_PROXY_SITE = $(call github,docker,libnetwork,$(DOCKER_PROXY_VERSION))
 
 DOCKER_PROXY_LICENSE = Apache-2.0