Add Jinja2 to requirements file.

Moving other requirements from extra-requirements.txt wasn't possible
because those requirements are not uficially considered an OpenStack
requirements and would be refused by openstack check-requirements
upstream job. We should thereofre thread those requirements as
still extras.

Change-Id: Idd3c7daf38cbcac4d3c0253f13034529aaeb5167

extra-requirements.txt

@@ -3,4 +3,3 @@
 ansible>=2.4.0       # GPLv3
 os-faults>=0.1.18    # Apache-2.0
 cryptography<=2.2.2  # Apache-2.0
-Jinja2>=2.8.0        # BSD

requirements.txt

@@ -1,7 +1,8 @@
 # Tobiko framework requirements
 
 fixtures>=3.0.0              # Apache-2.0/BSD
-keystoneauth1>=>=3.4.0       # Apache-2.0
+keystoneauth1>=3.4.0         # Apache-2.0
+Jinja2>=2.8.0                # BSD
 netaddr>=0.7.18              # BSD
 neutron-lib>=1.25.0          # Apache-2.0
 oslo.config>=5.2.0           # Apache-2.0