Fix requirements

1. remove unused requirement: mock-requests. This is due to the fact
   that is is unused.
2. Update sphinx
3. Uncap evenlet: uncap eventlet. We will manage the eventlet
   version using constraints now. See the thread starting at
   http://lists.openstack.org/pipermail/openstack-dev/2018-April/129096.html
   for more details.
4. Update RYU to be 4.24 to sort out issues with pip 10

Co-Authored-By: Doug Hellmann <doug@doughellmann.com>

Change-Id: I855f88ca09a735054c3582f16d8eff977dc53ce1

lower-constraints.txt

@@ -116,11 +116,10 @@ PyYAML==3.12
 reno==2.5.0
 repoze.lru==0.7
 requests==2.14.2
-requests-mock==1.1.0
 requestsexceptions==1.2.0
 rfc3986==0.3.1
 Routes==2.3.1
-ryu==4.14
+ryu==4.24
 simplejson==3.5.1
 six==1.10.0
 snowballstemmer==1.2.1

requirements.txt

@@ -3,7 +3,7 @@
 # process, which may cause wedges in the gate later.
 pbr!=2.1.0,>=2.0.0 # Apache-2.0
 
-eventlet!=0.18.3,!=0.20.1,<0.21.0,>=0.18.2 # MIT
+eventlet!=0.18.3,!=0.20.1,>=0.18.2 # MIT
 httplib2>=0.9.1 # MIT
 netaddr>=0.7.18 # BSD
 SQLAlchemy!=1.1.5,!=1.1.6,!=1.1.7,!=1.1.8,>=1.0.10 # MIT

test-requirements.txt

@@ -8,8 +8,7 @@ fixtures>=3.0.0 # Apache-2.0/BSD
 flake8-import-order==0.12 # LGPLv3
 mock>=2.0.0 # BSD
 python-subunit>=1.0.0 # Apache-2.0/BSD
-requests-mock>=1.2.0 # Apache-2.0
-sphinx!=1.6.6,!=1.6.7,>=1.6.2 # BSD
+sphinx!=1.6.6,!=1.6.7,>=1.6.5 # BSD
 openstackdocstheme>=1.18.1 # Apache-2.0
 oslo.concurrency>=3.25.0 # Apache-2.0
 os-testr>=1.0.0 # Apache-2.0
@@ -21,4 +20,4 @@ WebTest>=2.0.27 # MIT
 oslotest>=3.2.0 # Apache-2.0
 reno>=2.5.0 # Apache-2.0
 tempest>=17.1.0 # Apache-2.0
-ryu>=4.14 # Apache-2.0
+ryu>=4.24 # Apache-2.0