report the proxy version instead of weaveexec version
report the proxy version instead of weaveexec version

That way we no longer rely on the weavexec image version tag, which
may not always be present. Since the proxy is embedded in the
weaveexec image, this effectively versions the image.

Also report the *local* script version instead of the embedded script
version. There is no point in reporting the latter since it will
always match the weaveexec version.

Closes #1341.

rade/weave,beni55/weave,paulbellamy/weave,paulbellamy/weave,dpw/weave,aaam/weave,awanke/weave,aaam/weave,awanke/weave,n054/weave,awanke/weave,dpw/weave,bboreham/weave,rade/weave,paulbellamy/weave,beni55/weave,beni55/weave,tomwilkie/weave,squaremo/weave,awh/weave,n054/weave,weaveworks/weave,awanke/weave,dpw/weave,squaremo/weave,squaremo/weave,tomwilkie/weave,aaam/weave,awh/weave,aaam/weave,paulbellamy/weave,bboreham/weave,beni55/weave,tomwilkie/weave,bboreham/weave,beni55/weave,awanke/weave,weaveworks/weave,rade/weave,n054/weave,tomwilkie/weave,rade/weave,weaveworks/weave,weaveworks/weave,bboreham/weave,dpw/weave,squaremo/weave,tomwilkie/weave,n054/weave,bboreham/weave,aaam/weave,dpw/weave,n054/weave,awh/weave,awh/weave,rade/weave,awh/weave,squaremo/weave