Update Geoserver in Dockerfile to 2.6.1

LukeSwart

2014-12-29 a8b1adfe1cb3569f2732d3eab53af50245cbac1c

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#Acquire::http { Proxy "http://192.168.2.9:3142"; };
#Acquire::http { Proxy "http://192.168.0.101:3142"; };