go: Update to latest keystone package API & Remove unnecessary else

- 'beta' and renaming is unnecessary

Signed-off-by: Koichi Shiraishi <zchee.io@gmail.com>

- Currently can't building because not found const variables

- panic built-in function is always exist of program. Remove else and
  export 'ks' variable in the main function

Signed-off-by: Koichi Shiraishi <zchee.io@gmail.com>

fix memory leaks in ks_asm().

use KS_ERR_NOMEM instead of -1.

Remove call to time to fix pip install

On recent Ubuntu, 'time' is provided either by the 'time' package, or as a bash builtin. It's not present in sh, or installed by default. This causes 'pip install keystone-engine' to fail.

So, one of the following needs to happen:
-'time' package is added to the pre-reqs
-switch this script to bash
-remove the 'time' call around make

I've axed the call to 'time', but really whatever you think is best.

This reverts commit f18b6e19.

add regress for #226