Signed-off-by: Ndlorenc <dlorenc@google.com>

There were a few cases where stdout wasn't getting flushed correctly,
leading to flakiness in e2e tests.

Some Linux distributions package go-bindata and don't allow to
download any code or binaries during build time.

linux is upgraded to 4.16, binutils is upgraded to 2.30, and
libelf is installed for the newer kernel.

Other configuration changes are changes in defaults and ordering.

Now using glibc 2.27. systemd 237, and Go 1.10.

vbox-guest is removed because it's upstream as of linux 4.16.

More on buildroot at https://git.buildroot.net/buildroot/tree/CHANGES

This was a bit overkill.

formating->formatting

The purpose of these changes is to enhance Hyperkit support from the
minikube command line for better integration with enterprise networks
behind a VPN.

uuid: Provide VM UUID to restore MAC address (only supported with
      Hyperkit driver).
vpnkitSock: Location of the VPNKit socket used for networking. If empty,
            disables Hyperkit VPNKitSock, if 'auto' uses Docker for Mac
            VPNKit connection, otherwise uses the specified VSock."
vsockPorts: List of guest VSock ports that should be exposed as sockets
            on the host (Only supported on with hyperkit now).

Note:
tests pass but file:
`vendor/github.com/google/certificate-transparency/go/x509/root_darwin.go`
has to be edited to correct an issue - not committed since this is in
the vendor directory.

Made caching async with block for completion before copy of images into cluster. Default imageing caching to false

Update to catch any errors in loading of cached images into Docker cache in VM which were previously being ignored and leading to unreliable "minikube start" especially in offline mode.

Addressed race condition caused by async image caching with no wait which resulted in unreliable image loading and prevented offline execution of "minikube start".

to also mention how to install via homebrew.

`elevateKubeSystemPrivileges` was using `GetClientset` function
and getting the err object from, but err wasn't checked.

out/localkube.d and out/minikube-* targets should be able to build
on every architecture.

Signed-off-by: Nkairen <kyle.b@inwinstack.com>

Trivial change to point to the correct URL.