Bump upper constraints to fix conflicts

Without these changes, I'm currently seeing:

  python-novaclient 11.1.0 has requirement PrettyTable<0.8,>=0.7.2, but you'll have prettytable 0.7.1 which is incompatible.
  python-magnumclient 2.11.0 has requirement PrettyTable<0.8,>=0.7.2, but you'll have prettytable 0.7.1 which is incompatible.
  python-watcherclient 2.2.0 has requirement oslo.i18n>=3.20.0, but you'll have oslo-i18n 3.19.0 which is incompatible.
  python-watcherclient 2.2.0 has requirement oslo.utils>=3.36.0, but you'll have oslo-utils 3.35.0 which is incompatible.
  python-watcherclient 2.2.0 has requirement PrettyTable<0.8,>=0.7.2, but you'll have prettytable 0.7.1 which is incompatible.
  kubernetes 8.0.1 has requirement urllib3>=1.23, but you'll have urllib3 1.22 which is incompatible.
  python-monascaclient 1.12.1 has requirement PrettyTable<0.8,>=0.7.2, but you'll have prettytable 0.7.1 which is incompatible.
  python-heatclient 1.17.0 has requirement PrettyTable<0.8,>=0.7.2, but you'll have prettytable 0.7.1 which is incompatible.
  python-troveclient 2.17.0 has requirement PrettyTable<0.8,>=0.7.2, but you'll have prettytable 0.7.1 which is incompatible.
  python-muranoclient 1.1.1 has requirement PrettyTable<0.8,>=0.7.2, but you'll have prettytable 0.7.1 which is incompatible.
  python-senlinclient 1.9.0 has requirement PrettyTable<0.8,>=0.7.2, but you'll have prettytable 0.7.1 which is incompatible.
  cliff 2.14.0 has requirement PrettyTable<0.8,>=0.7.2, but you'll have prettytable 0.7.1 which is incompatible.
  osprofiler 2.5.2 has requirement PrettyTable<0.8,>=0.7.2, but you'll have prettytable 0.7.1 which is incompatible.
  python-watcherclient 2.2.0 has requirement oslo.i18n>=3.20.0, but you'll have oslo-i18n 3.19.0 which is incompatible.
  python-watcherclient 2.2.0 has requirement oslo.utils>=3.36.0, but you'll have oslo-utils 3.35.0 which is incompatible.
  kubernetes 8.0.1 has requirement urllib3>=1.23, but you'll have urllib3 1.22 which is incompatible.
  requests 2.19.1 has requirement urllib3<1.24,>=1.21.1, but you'll have urllib3 1.24 which is incompatible.

when installing rally-openstack with pip:

  pip install .

and this is what I see when I try and run rally:

  (venv-rally) [will@dev-director rally-openstack]$ rally deployment create --fromenv --name existing
  2019-01-17 14:10:09.005 21837 WARNING rally.common.plugin.discover [-] 	 Failed to load plugins from module 'rally_openstack' (package: 'rally-openstack 1.3.1.dev70'): (prettytable 0.7.1 (/home/will/venv-rally/lib/python2.7/site-packages), Requirement.parse('PrettyTable<0.8,>=0.7.2'), set(['python-novaclient', 'python-magnumclient', 'python-watcherclient', 'python-monascaclient', 'python-heatclient', 'python-troveclient', 'python-muranoclient', 'python-senlinclient', 'osprofiler'])): ContextualVersionConflict: (prettytable 0.7.1 (/home/will/venv-rally/lib/python2.7/site-packages), Requirement.parse('PrettyTable<0.8,>=0.7.2'), set(['python-novaclient', 'python-magnumclient', 'python-watcherclient', 'python-monascaclient', 'python-heatclient', 'python-troveclient', 'python-muranoclient', 'python-senlinclient', 'osprofiler']))

some of these errors are coming from constraints in rally itself, please
see the `Depends-On` link.

Depends-On: https://review.openstack.org/631524
Change-Id: I6b46a17535d0b8fe70411c6052c0d874d6b0dae4

upper-constraints.txt

@@ -64,7 +64,7 @@ oslo.concurrency===3.28.1
 oslo.config===6.5.1
 oslo.context===2.21.0
 oslo.db===4.41.1
-oslo.i18n===3.22.1
+oslo.i18n===3.23.0
 oslo.log===3.40.1
 oslo.serialization===2.28.1
 oslo.utils===3.37.0
@@ -116,7 +116,7 @@ python-zaqarclient===1.10.0
 pytz===2018.5
 PyYAML===3.13
 rally===1.2.1
-requests===2.19.1
+requests===2.21.0
 requests-oauthlib===1.0.0
 requestsexceptions===1.4.0
 rfc3986===1.1.0
@@ -138,7 +138,7 @@ traceback2===1.4.0
 ujson===1.35
 unicodecsv===0.14.1
 unittest2===1.1.0
-urllib3===1.23
+urllib3===1.24.1
 virtualenv===16.0.0
 warlock===1.3.0
 wcwidth===0.1.7