Update common.sh

Update common.sh

Revert "Fix flag.Parse error logging"

Fix flag.Parse error logging

* more reliable stop for none driver

* print stop error

* better error logging

* misspell

* error formatting

* Passing lint interfacer nag

* Validate None driver is supported on current OS

* Add Virtualbox tests to validateOSSupportVMDriver

* Add Hyperv driver OS validation

* Add Hyperkit driver OS validation

* Add Kvm2 driver OS validation

* Refactor driver validation to use IsValidDriver

Add libvirt package to the Fedora documentation

Bump k8s.io/kubernetes to 1.15.0

* Lowering memory for golangci-lint

* ci 2 jobs , gogc 5

* change ci jobs number

* added a new make target for ci and for developers

* reuse golint options for two targets

Limit the number of golangci-lint jobs to one

This will again increase the total test time.

But hopefully make it use less memory as well.

If you want the old behaviour back, use:
e.g. make lint GOLINT_JOBS=`nproc`

Running multiple linters takes a lot of RAM.
And it only saves us like 15 seconds anyway ?

Show info about the minikube linux distribution

pinning go version in travis

* Add warn if hyperkit driver version is old

* Add hyperkit upgrade documentation

* Improve kvm/hyperkit upgrade warn message

* Move validateDriverVersion to before downloading ISO

* Change executable to use constants

Upgrade libmachine to master

Not very friendly to return nil without error

Makes it more clear that it is os-release(5)

Taking from /etc/os-release, via libmachine provision

Failure to show it is not fatal, just log an error...

* Console output cleanup

* comment fix

* Fixing out.Out stutter

* Fix invalid template

* Change profile_list.go to new console functions

* more merge stuff

Make cluster_test and utils_test run in isolation

Fix profile list error handling