Remove requirements.txt from tox.ini

Now inserted by PBR

Change-Id: I02a15850ed5fb6f98d1d35229565f8142964f53b

tox.ini

@@ -7,8 +7,7 @@ skipsdist = True
 setenv = VIRTUAL_ENV={envdir}
 usedevelop = True
 install_command = {toxinidir}/tools/tox_install.sh {opts} {packages}
-deps = -r{toxinidir}/requirements.txt
-       -r{toxinidir}/test-requirements.txt
+deps = -r{toxinidir}/test-requirements.txt
 whitelist_externals = sh
 commands =
   sh tools/pretty_tox.sh '{posargs}'
@@ -81,8 +80,6 @@ setenv =
  TEMPEST_CONFIG_DIR={env:TEMPEST_CONFIG_DIR:/opt/stack/tempest/etc}
 
 [testenv:scenario]
-deps = -r{toxinidir}/requirements.txt
-       -r{toxinidir}/test-requirements.txt
 sitepackages = True
 setenv =
  OS_TEST_PATH={toxinidir}/neutron_lbaas/tests/tempest/v2/scenario
@@ -90,8 +87,6 @@ setenv =
  TEMPEST_CONFIG_DIR={env:TEMPEST_CONFIG_DIR:/opt/stack/tempest/etc}
 
 [testenv:ddt]
-deps = -r{toxinidir}/requirements.txt
-       -r{toxinidir}/test-requirements.txt
 sitepackages = True
 setenv =
  OS_TEST_PATH={toxinidir}/neutron_lbaas/tests/tempest/v2/ddt