Rally bash completion doesnt exist in a virtualenv

[Imran Hayder]

OVERVIEW:
When trying to install latest master branch of rally as following:

$ ./install_rally.sh -v -y --target $WORKSPACE/rally-install

it installs everything successfully.. but fails upon :

`source $WORKSPACE/rally-install/bin/activate `

DETAILS:
I am installing rally using jenkins, and in jenkins $WORKSPACE is automatically set for each job , which is the pwd of that job dir .
using above commands, i was installing rally in separate virtualenv, but it failed at activating the virtualenv complaining :

====================
. /var/lib/jenkins/workspace/rally_experiment/rally-install/etc/bash_completion.d/rally.bash_completion
/var/lib/jenkins/workspace/rally_experiment/rally-install/bin/activate: line 82: /var/lib/jenkins/workspace/rally_experiment/rally-install/etc/bash_completion.d/rally.bash_completion: No such file or directory

 Build step 'Execute shell' marked build as failure
====================

Now upon inspecting the 'install_rally.sh" script, i saw this:

~~~~~~~~~~~~~~~~
# Post-installation
if [ "$USEVIRTUALENV" = 'yes' ]
then
    # Fix bash_completion
. "$VENVDIR/etc/bash_completion.d/rally.bash_completion"
__EOF__

    cat <<__EOF__
~~~~~~~~~~~~~~~~~~

this just looks plain wrong, reason being::

1) who is copying the rally bash completion to virtualenv dir and where ????
2) the pip virtualenv doesnt even create 'etc` dir ,, let alone ` bash_completion.d ` .

SOLUTIONS:
i temporarily worked around with this :
`````````
# Post-installation
if [ "$USEVIRTUALENV" = 'yes' ]
then
    # Fix bash_completion
    mkdir -p "$VENVDIR"/etc/bash_completion.d && cp -r etc/rally.bash_completion "$VENVDIR"/etc/bash_completion.d/
    cat >> "$VENVDIR"/bin/activate <<__EOF__

. "$VENVDIR/etc/bash_completion.d/rally.bash_completion"
__EOF__

    cat <<__EOF__
```````````

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/188748

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/188748
Committed: https://git.openstack.org/cgit/openstack/rally/commit/?id=e8fbd0d2a1ee71d328bf1ed32e8b84216e409230
Submitter: Jenkins
Branch: master

commit e8fbd0d2a1ee71d328bf1ed32e8b84216e409230
Author: Sergey Skripnick <email address hidden>
Date: Fri Jun 5 14:29:44 2015 +0300

    Use absoulote path to venv in installation script

    Activation script should work when called from any directory.
    Closes-Bug: 1461336

    Change-Id: I5aa3699d48ebe2735d273791888826edd4878c64