Rename .nova-venv to .venv.

This simplifies a number of Jenkins jobs which currently, other
than directory names, could be the same for all OpenStack
projects. By renaming the virtualenv directory, the redundant
Jenkins virtualenv build and copy jobs can be eliminated.

Change-Id: Ieaf1dac3207ecb34b911c7edcd2086809abdf49e

install_venv.py

@@ -31,7 +31,7 @@ import platform
 
 
 ROOT = os.path.dirname(os.path.dirname(os.path.realpath(__file__)))
-VENV = os.path.join(ROOT, '.nova-venv')
+VENV = os.path.join(ROOT, '.venv')
 PIP_REQUIRES = os.path.join(ROOT, 'tools', 'pip-requires')
 PY_VERSION = "python%s.%s" % (sys.version_info[0], sys.version_info[1])
 
@@ -235,7 +235,7 @@ def print_help():
     To activate the Nova virtualenv for the extent of your current shell
     session you can run:
 
-    $ source .nova-venv/bin/activate
+    $ source .venv/bin/activate
 
     Or, if you prefer, you can run commands in the virtualenv on a case by case
     basis by running:

with_venv.sh

@@ -1,4 +1,4 @@
 #!/bin/bash
 TOOLS=`dirname $0`
-VENV=$TOOLS/../.nova-venv
+VENV=$TOOLS/../.venv
 source $VENV/bin/activate && $@