Ensure proxy works well in docker

[keith-turner]

Not sure all that this entails. When making Fluo and Accumulo work well in docker it was important that the script could accept options on the command line. Would be nice if the proxy script also did this, so could do something like.

docker run accumulo-proxy -o proxyopt1=foo -o proxyopt2=foofoo

Also, if the default proxy log4j config just prints stuff to stdout, this works nicely when running in docker.

This is related to #5

[keith-turner]

To be more precise I am thinking the tarball proposed in #5 should work well when used by a simple docker build file to create a docker image.

[volmasoft]

I'll take a bash at this next week if no one else picks it up (which I suspect not given the age :))

[volmasoft]

@keith-turner In case you've not seen it, a WIP pull request with questions is now open here: #20

[keith-turner]

Done in #20