Ensure that ip_forwarding is always enabled for compute and network

Libvirt gets this in most cases, but it can be disabled.  This is
belts + suspenders + super glue...

Fixes bug 885274

Change-Id: Ifb8d627689800b23cce02a623caa525cd17e507d
Configure nova-rootwrap

* Nova runs as the same user as the rest of devstack and due to the
  sudo configuration for devstack itself it may be possible that
  root subprocess execution that doesn't go through utils.execute() will
  not be caught by the expected sudo failure.

Fixes bug 944373

Change-Id: I0554b3850a59d065059f8ad349c8ff8fb7cfa132
Improve devstack docs for Xenserver

Minor fixes to scripts

Fixes bug 943508

Change-Id: Iaf12b9d67efa78623e8253599010f60192b4af64
Moves python-cloudfiles dependency back to PIP.

For reasons currently unknown, apt-get seems to install
an unusably old version of python-cloudfiles in some
small subset of cases. To avoid that frustration for the
users it does affect, this patch moves python-cloudfiles
back to being installed by pip instead.

Fixes bug 931269.

Change-Id: I4c2e17ddcc0c0d327b3810b4fd4db117076df069
Change the default mac range to not 0

This fixes some of the confusion caused by
Bug 947382

zoinks! set the U/L bit

Change-Id: I3a610e3aa3904fdb82ad314c3fd1d06c6017f46c
update policy driver

Change-Id: I2450806d27455ae8304446f5b6054e14a66658b1
Remove trailing whitespaces in regular file

Change-Id: I5faf840dd6649afcb53e91f1d033447f9729cee1
Add hacking guideline

After all, it _was_ docday when this was proposed!

This is by no means complete but some of this has come up a lot recently.

Change-Id: I72300506e1c74077d3f9e6bbabea3b2a25a8e829
support glance only mode by if...then checking for is_service_enabled nova.
removed redundant is_service_enabled checks for screen_it processes.
fixes bug 885767

Change-Id: I4441e8d0e9d7b96770923721fa97dbd10c4379a8
Make sure Logdir is created.

- FIxes bug 950902.

Change-Id: I1e387b4c97551744673281fdeae61d87c1fc39ab
Merge "Change the default mac range to not 0"
Merge "Make sure Logdir is created."
Merge "Add hacking guideline"
Remove calls to service-create in devstack for now.

 * The recommended backend for essex is the template backend.
 * Fixes bug 950213

Change-Id: I2f8bc9f74cee2d783cbadcc1d4d4e674ddb905b9
Implement logging of screen windows.

- Fixes bug 945231.

Change-Id: Ie26555d3e99905ba053510f6b08822b1043aa974
Merge "Fix dependency list generation corner cases"
Merge "Ensure that ip_forwarding is always enabled for compute and network"
Move all EC2 cred creation to eucarc

* Remove credential creation from files/keystone_data.sh
* Remove EC2 cert setup from openrc
* Remove sourcing of ec2rc from stackrc
* Collect the above in eucarc
* Allow rc files to be sourced from other directories; based on Chmouel's
  4881 proposal but is simpler and doesn't actually change the directory
* Create S3 endpoint
* Get EC2 and S3 endpoints from Keystone service catalog
* Add EC2 credential checks to exercises/client-env.sh
* exercises/bundle.sh and exercises/euca.sh use eucarc

Updates:
* remove readlink -f to stay bash 3 compatible
* use service catalog
* create S3 endpoint

Fixes bug 949528

Change-Id: I58caea8cecbbd10661779bc2d150d241f4a5822e
Merge "support glance only mode by if...then checking for is_service_enabled nova. removed redundant is_service_enabled checks for screen_it processes. fixes bug 885767"
Merge "Remove calls to service-create in devstack for now."