* add better error support to check if vm exists use path.Join so that it looks up the VM correctly turn off VM if it is still running
* fix the vsphere-clone also
* add a common precleanvm to the driver to dedupe iso and clone logic, reduce the if nesting
* Add golangci-lint as linting tool
* Disable failing staticchecks to start; GitHub issue to handle coming soon
* Run `goimports -w` to repair all source files that have improperly
formatted imports
* makefile: Add ci-lint target to run on travis
This change adds a new make target for running golangci-lint on newly
added Go files only. This target is expected to run during Packer ci builds.
* .github/contributing: Add code linting instructions
* travis: Update job configuration to run parallel builds
Megan Marsh
Sylvia Moss
jhawk28
Rui Lopes
Wilken Rivera
Chris Doherty