Changes

Check for golang 1.8.
* Addressing
[INFO] Detected go version: go version go1.8.3 linux/amd64.
[ERROR] Please install Go version 1.7 or use PERMISSIVE_GO=y to bypass
this check.
with
$ rpm -q golang golang-1.8.3-2.fc26.x86_64
$ go version go version go1.8.3 linux/amd64
* Revert "disable go version checking"
This reverts commit 715e2f68718a7db9b93916ff95de60993d9bac1b.
* Using os::log::fatal -- the original impl was correct when it was 
written, before os::log::fatal existed, but is not now.
 (commit: d5ed80b)