tree a4b7350f36385dbed82a0c792d9f270a5ac7085c
parent d4daea700b5ac515edb7d3da357807026a6ca7c7
author Adam Sadovsky <asadovsky@gmail.com> 1455752395 -0800
committer Adam Sadovsky <asadovsky@gmail.com> 1455752395 -0800

lib: add pkg lookpath, and make gosh use it

Details:
- Moves lookpath functionality out of v.io/x/lib/envvar, to
a new package named v.io/x/lib/lookpath
- Updates gosh to use this package, using the dirs from the
Shell's PATH variable

MultiPart: 2/2

Change-Id: I1a357758183cccf3a950176a3bc5bdf48d7fb887