Add lower bound for all dependencies with upper bound

If we care about a max version of a package, also
specify the min version to have a range to check for.
Specify min version always in a '>=' fashion.
This simplifies a bit of the handling, as the first
given range is always the lower bound.

Also raise websockify to 0.5.1 in preparation of
https://review.openstack.org/#/c/35365/

Change-Id: Ia2672d675446f2ce9932c0c8b09e7b3c2c9cc392

requirements.txt

@@ -22,7 +22,7 @@ jinja2
 jsonrpclib
 jsonschema>=1.0.0,!=1.4.0,<2
 kazoo>=0.9,<=1.1
-kombu>2.4.7
+kombu>=2.4.8
 lockfile>=0.8
 lxml>=2.3
 msgpack-python
@@ -37,7 +37,7 @@ paste
 pastedeploy>=1.5.0
 pbr>=0.5.16,<0.6
 pecan>=0.2.0
-pip>1.0
+pip>=1.1
 prettytable>=0.6,<0.8
 psutil<1.0
 pyasn1
@@ -74,7 +74,7 @@ stevedore>=0.9
 suds>=0.4
 warlock>=0.7.0,<2
 webob>=1.2.3,<1.3
-websockify<0.4
+websockify>=0.5.1,<0.6
 wsgiref>=0.1.2
 wsme>=0.5b2
 xattr>=0.4

test-requirements.txt

@@ -40,7 +40,7 @@ oslo.sphinx
 swift
 testrepository>=0.0.13
 testresources<0.3
-testscenarios<0.5
+testscenarios>=0.4,<0.5
 testtools>=0.9.32
 unittest2
 webtest==1.3.3