* pkg/terminal: support ctrlz for shell job control
This required forking peterh/liner under the go-delve org and using that
instead since upstream is not open to supporting this feature.
Fixes#2157
* Update liner
* Update liner but correctly this time
* upgrade golang.org/x/tools to 0.1.9
This change update liner to the latest release that adds support to
delete the next and the previous word with Alt-d and Alt-BackSpace
plus a small amount of fixes.