Bug 1265365

Neutron is currently missing the python-pecan dependency:
https://github.com/openstack/neutron/blob/957ac2b83e5beeff0b77e955a3a3475af016d27c/requirements.txt#L12

This is not a new dependency from today so my theory is that another project used and dropped pecan which neutron was feeding on.

pecan is not listed as a dependency for the package right now:
https://github.com/openstack-packages/neutron/blob/e1338eeab15fc5ab14a9f21a8be90d19845dd6ed/openstack-neutron.spec

This is causing neutron-server to fail to start:
 neutron-server[29019]: File "/usr/lib/python2.7/site-packages/neutron/cmd/eventlet/server/__init__.py", line 15, in <module>
 neutron-server[29019]: from neutron.server import wsgi_pecan
 neutron-server[29019]: File "/usr/lib/python2.7/site-packages/neutron/server/wsgi_pecan.py", line 22, in <module>
 neutron-server[29019]: from neutron.pecan_wsgi import app as pecan_app
 neutron-server[29019]: File "/usr/lib/python2.7/site-packages/neutron/pecan_wsgi/app.py", line 19, in <module>
 neutron-server[29019]: import pecan
 neutron-server[29019]: ImportError: No module named pecan
 systemd[1]: neutron-server.service: main process exited, code=exited, status=1/FAILURE
 systemd[1]: Failed to start OpenStack Neutron Server.

python-pecan currently in repo is outdated:
# yum info python-pecan
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
 * epel: mirror.cogentco.com
Available Packages
Name        : python-pecan
Arch        : noarch
Version     : 0.8.3
Release     : 1.el7
Size        : 281 k
Repo        : delorean-common-testing/x86_64
Summary     : A lean WSGI object-dispatching web framework
URL         : http://github.com/dreamhost/pecan
License     : BSD
Description : A WSGI object-dispatching web framework, designed to be lean and
            : fast with few dependencies

We need to:
1) Bump python-pecan to 1.0.2 (neutron requires >= 1.0.0)
2) Add python-pecan as a dependency to neutron