run_binary doesn't use target's RunEnvironmentInfo

[dmivankov]

If say sh_binary target has env= set, then running target directly uses env, but under run_binary env= values are getting lost.

Looks related to #409 but run_binary isn't covered there

[fmeum]

This is expected, env is only meant for bazel test and run, it doesn't have an effect on a target if it is used as a tool in an action.