CI: Retry GitHub status updates

* Refactor config.Config to prepare for multinode

* merge conflict

* removing GetMachineName()

* replacing GetMachineName with a config lookup

* fix tests

* making unit tests happy

* fixing concurrent map writes, only right to viper once

* debugging

* one last test fix

* DeleteAlwaysSucceeds should actually always succeed

* prevent panic when deleting nonexistant cluster

* remove last GetMachineName reference

Health check previously configured driver & exit if not installed

Add memory and wait longer for TestFunctional tests, include node logs

Improve message when selected driver is incompatible with existing cluster

Update roadmap & principles for 2020 (comments & discussion welcome!)

Update libmachine to point to latest

mention fix for AppArmor related permission errors

go mod tidy

Add 'make help' to list all targerts

Executing 'make help' will display a list of available targets
for building minikube. The output will look as follows

Available targets for minikube v1.4.1
--------------------------------------
iso-menuconfig                 Configure buildroot configuration
linux-menuconfig               Configure Linux kernel configuration
all                            Build all different minikube component
drivers                        Build Hyperkit and KVM2 drivers
docker-machine-driver-hyperkit Build Hyperkit driver
integration                    Trigger minikube integration test
integration-none-driver        Trigger minikube none driver test
integration-versioned          Trigger minikube integration testing

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