add quotes around editable requirement

quotes are needed around the repo link otherwise it will not
install, thinking the package was not specified:

  pip install -q -U -e git+https://git.openstack.org/openstack/tosca-parser.git
  --editable=git+https://git.openstack.org/openstack/tosca-parser.git
  is not the right format; it must have #egg=Package

Co-Authored-By: Sahdev Zala <spzala@us.ibm.com>

Change-Id: Ib26f388823a95a870027a9e0ab127c8d760e2ad6

run_py27-tosca-parser-master.sh

@@ -0,0 +1,3 @@
+#!/bin/bash
+
+pip install -q -U -e "git+https://git.openstack.org/openstack/tosca-parser.git#egg=tosca_parser"

tox.ini

@@ -29,7 +29,7 @@ commands = oslo_debug_helper -t translator/tests {posargs}
 
 [testenv:py27-tosca-parser-master]
 commands =
-    pip install -q -U -e git+https://git.openstack.org/openstack/tosca-parser.git#egg=tosca_parser
+    ./run_py27-tosca-parser-master.sh
     python setup.py test --slowest --testr-args='{posargs}'
 
 [flake8]