Stop hard-coding the OpenStack PyPI mirror.

os-svc-install doesn't need to hard-code the OpenStack PyPI mirror :
doing so prevents the pypi element from fully benefiting image builds,
and the pypi-openstack element can select the OpenStack PyPI mirror
when that is needed.

Change-Id: Ibc73d11d776c89cf1b4ff12cdcd5b8d8b76a176d

elements/os-svc-install/bin/os-svc-install

@@ -1,12 +1,6 @@
 #!/bin/bash
 set -eux
 
-# Use the pypi mirror, it's reliable and all openstack svc's have their
-# dependencies in it.
-pypi_mirror=http://pypi.openstack.org/openstack/
-pip_install="pip install -i $pypi_mirror "
-
-
 function python-install() {
   local name=$1
   local svc_root=$2
@@ -39,12 +33,12 @@ function python-install() {
   pip install -U 'setuptools>=1.0'
 
   if [ -n "$reqs" ] ; then
-       $pip_install -r $reqs
+       pip install -r $reqs
        # FIXME: pip requires doesn't include MySQL-python
        pip install MySQL-python
   fi
 
-  $pip_install $svc_root
+  pip install $svc_root
 
   set +u
   deactivate