Reset 192.0.2.1 hostkey for new seed VM's.

When a new VM is setup, new SSH host keys are created.

Change-Id: I1116a4193b7e07e9c9c0aead26e08808d346f160
Be clearer about customising downloaded images.

We wouldn't want someone customising their local shell...

Change-Id: I8d870140a4c43527e78c131014d2daac9bd79c09
Advise folk to sit in $TRIPLE_ROOT not incubator.

The incubator directory shouldn't be assumed to be the working
directory as our tools need to be installable.

Telling folk to cd to it makes it special and increases the chance of
accidentally making code assume it is the working directory.

Change-Id: Ib09407e1ce97fa5fd12d4b7387e57d04e9f002d3
Fix a small typo.

Change-Id: Ifd05af9026daf54ba5c5707954cc695cb756f8a3
Stop copying stackrc out of clouds.

The static stackrc we embed in cloud images isn't suitable for using
from outside the cloud, instead we make one in the incubator which is.
We already did that for the under and overclouds, now do it for the
seed cloud too.

Fixes bug 1191650

Change-Id: Id5b6fa77191e5231df77192a900059069ebef6c6
Setup new cloud neutron config via APIs.

The network configuration within a cloud is global configuration, not
per-instance configuration : heat metadata is the wrong vehicle for
expressing it, as heat would result in multiple network nodes trying
to apply the same change (for instance).

Change-Id: Ifee7183aca4b18ae412eaa5f97ad6680dbaa291a
Bump the size of test VM's to 1GB memory.

Looks like 768MB is not enough.

Fixes bug: 1211271

Change-Id: I0892e1e573c7339965d1efe87137ff1537923e5c