Add link to minikube copr repository for Fedora/CentOS/Red Hat

small typo fix

In main text of this doc, "minikube" and "Minikube" both appears. 
Minikube is a proper noun. So it's better use same format in a doc.

line 87: "file sever" should be replaced with "file server"

Upgrade Docker, from 17.09 to 17.12

Add the ValidatingAdmissionWebhook controller.

deactivated hsts by default

Issue #2599 Add sshfs support for minikube iso

- Add registry to register all supported drivers in different platforms.
- Add DriverDef to define driver's metadata.
- All driver support logic moved to pkg/minikube/drivers, removed all
  driver name switches scattered in different packages.

Use ListDrivers() method to get the list of VM drivers.
SupportedVMDrivers become the whole list of VM drivers on all
platforms, which is used in gendocs only.

Different platform has differnet list of supported drivers. The
registry contains the correct list of drivers that are supported. In
future we could add commands like `minikube list-drivers`

Added note about where to find plugin configuration.

HSTS has been deactivated explicitly by default for the ingress controller in minikube, because it causes trouble for local development. Minikube is intended for local development, so this feature should not be turned on by default.

Type fix "iso"->"ISO"

In this doc, "ISO" is written some in capitals, some not in. please keep consistency.

Documentation fix.

Resolves #2559

Remove --skip-preflight-checks, ignore unwanted checks

Update to k8s v1.9.3.

Before we would hardcode the repo path that we are looking for.
Currently we include everything from the organization (k8s.io).

Before we would only add the files from the dependencies,
not the file from the actual module (such as "main.go").

Instead of running `go list` every time (very slow),
cache the results in the build folder and include it.

Add a shell helper script, to make the Makefile more
readable. Use regular "makedepend" syntax for output.

Make sure that all invocations are identical, before trying to make
a function out of it. Also clean up whitespace and similar changes.

Having a phony target as a minikube dependency means that
it always needs to be rebuilt/copied, which is unnecessary.

Also clean up and simplify the syntax, thereby avoiding the
current copy/paste errors (that always come with duplication)

Adds note for specifying docker bridge for vm-driver=none

Fixes #2571

Add metrics-server as an addon

With passthrough mode we can enable KVM nesting for guests.

Fixes #2553
Signed-off-by: NFabian Deutsch <fabiand@fedoraproject.org>

This reverts commit 7a4babe1d6d0e90da3b8101cb349735f0ac16b1e.

For now we just hard-code passthrough.
Signed-off-by: NFabian Deutsch <fabiand@fedoraproject.org>