Upgrade to packer sdk - Githubissues

This is a continuation of #10 and also upgrades go from 1.14 to 1.16 (the goreleaser and github workflows depended on it so why not :smile:)

Testing

[x] Ubuntu example builds with a release made from goreleaser (specifically v0.3.0-dev9)


ddelnano@ddelnano-desktop:~/go/src/github.com/xenserver/packer-builder-xenserver$ packer1.7 build -debug  --var sr_name='Local storage' --var sr_iso_name=LocalISO examples/ubuntu-2004.json
Debug mode enabled. Builds will not be parallelized.
xenserver-iso: output will be in this color.

==> xenserver-iso: XAPI client session established ==> xenserver-iso: Starting HTTP server on port 8000 ==> xenserver-iso: Step: Create Instance ==> xenserver-iso: Using the following SR for the VM: OpaqueRef:10e7e21a-0569-4e6c-931e-d295a76a3be0 ==> xenserver-iso: Created instance '3bc8cada-550c-9f76-553a-f56defadb1c1' ==> xenserver-iso: Step: Start VM Paused ==> xenserver-iso: Step: Set SSH address to VM host IP ==> xenserver-iso: Set host SSH address to '192.168.88.89'. ==> xenserver-iso: Unpausing VM 3bc8cada-550c-9f76-553a-f56defadb1c1 ==> xenserver-iso: Waiting 10s for boot... ==> xenserver-iso: Connecting to the VM console VNC over xapi ==> xenserver-iso: Making HTTP request to initiate VNC connection: CONNECT /console?uuid=c1c0daaa-b9d8-812d-a004-21d0d408d8ba HTTP/1.0 ==> xenserver-iso: Cookie: session_id=OpaqueRef:0617a8df-1c4b-49f9-82cb-c934ae049160 ==> xenserver-iso: ==> xenserver-iso: ==> xenserver-iso: Received response: HTTP/1.1 200 OK ==> xenserver-iso: Connection: keep-alive ==> xenserver-iso: Cache-Control: no-cache, no-store ==> xenserver-iso: ==> xenserver-iso: xenserver-iso: Found local IP: 192.168.88.254 ==> xenserver-iso: Typing boot commands over VNC... ==> xenserver-iso: Finished typing. ==> xenserver-iso: Step: Wait for VM's IP to become known to us. xenserver-iso: Got IP '192.168.88.226' from HTTP request ==> xenserver-iso: Got IP address '192.168.88.226' ==> xenserver-iso: Creating a local port forward over SSH on local port 5900 ==> xenserver-iso: Port forward setup. 5900 ---> 192.168.88.226:22 on 192.168.88.89 ==> xenserver-iso: Using ssh communicator to connect: 192.168.88.226 ==> xenserver-iso: Waiting for SSH to become available... ==> xenserver-iso: Connected to SSH! ==> xenserver-iso: Step: Shutting down VM xenserver-iso: Executing shutdown command... ==> xenserver-iso: Shutdown command failed: Process exited with status 1 ==> xenserver-iso: WARNING: Forcing hard shutdown of the VM... xenserver-iso: Successfully shut down VM xenserver-iso: Successfully set VM as a template ==> xenserver-iso: Step: export artifact ==> xenserver-iso: Getting XVA https://xen.internal.ddelnano.com/export?uuid=3bc8cada-550c-9f76-553a-f56defadb1c1&session_id=OpaqueRef:0617a8df-1c4b-49f9-82cb-c934ae049160 ==> xenserver-iso: Download completed: packer-ubuntu-2004-x86_64-xenserver Build 'xenserver-iso' finished after 42 minutes 53 seconds.

==> Wait completed after 42 minutes 53 seconds

==> Builds finished. The artifacts of successful builds are: --> xenserver-iso: VM files in directory: packer-ubuntu-2004-x86_64-xenserver


- [x] Made sure that goreleaser and the github workflow creates working releases. [Here](https://github.com/ddelnano/packer-plugin-xenserver/actions/runs/638307104) is the build that built v0.3.0-dev9

## Todo
- [x] Fix unit tests
- [x] Add the unit tests back to the goreleaser build

I wasn't able to get the `packer init` working even though the releases should be named properly and this github repo now has the correct name. I figured we can follow up with that later possibly in #7 since that adds HCL examples (which are a requirement for `packer init`).

ddelnano / packer-plugin-xenserver

Upgrade to packer sdk #13

Testing