Equinix Move: Rebuild SmartOS Hosts

[ryanaslett]

This is a sub step of https://github.com/nodejs/build/issues/3597

The two release and four testing smartOS hosts need to be replaced. The current ones are running SmartOS 18 and SmartOS 20, which are both EOL.

In discussions with @bahamat It was determined that the likely targets for smartos should change to be SmartOS 21 and SmartOS 23

I plan to Provision the following hosts:

• [x] release-mnx-smartos21-x64-1
• [x] release-mnx-smartos23-x64-1
• [x] test-mnx-smartos21-x64-1
• [x] test-mnx-smartos21-x64-2
• [x] test-mnx-smartos23-x64-1
• [x] test-mnx-smartos23-x64-2

Once those are up I'll connect them to jenkins and we can run some preliminary tests to make sure they work and are accepting jobs.

Theres a non-zero chance that something has broken from smartos20 all the way to smartos23, so somebody with SmartOS/node knowledge is likely going to have to manage anticipated failures.