Make nosehtmloutput an optional test requirement

It is not strictly needed.

Change-Id: I37b2623ec834533a7ecae63084e2c2c04ecc1751

horizon/test/settings.py

@@ -116,7 +116,12 @@ NOSE_ARGS = ['--nocapture',
              '--all-modules']
 # TODO(amotoki): Need to investigate why --with-html-output
 # is unavailable in python3.
-if six.PY2:
+try:
+    import htmloutput  # noqa: F401
+    has_html_output = True
+except ImportError:
+    has_html_output = False
+if six.PY2 and has_html_output:
     NOSE_ARGS += ['--with-html-output',
                   '--html-out-file=ut_horizon_nose_results.html']
 

setup.cfg

@@ -22,6 +22,10 @@ classifier =
     Programming Language :: Python :: 3.5
     Topic :: Internet :: WWW/HTTP
 
+[extras]
+test =
+    nosehtmloutput>=0.0.3 # Apache-2.0
+
 [global]
 setup-hooks =
     openstack_dashboard.hooks.setup_hook

test-requirements.txt

@@ -18,7 +18,6 @@ mox3!=0.19.0,>=0.7.0 # Apache-2.0
 nodeenv>=0.9.4 # BSD
 nose # LGPL
 nose-exclude # LGPL
-nosehtmloutput>=0.0.3 # Apache-2.0
 nosexcover # BSD
 openstack.nose-plugin>=0.7 # Apache-2.0
 openstackdocstheme>=1.16.0 # Apache-2.0

tox.ini

@@ -13,7 +13,7 @@ setenv =
 whitelist_externals =
   bash
   find
-deps =
+deps = .[test]
   -r{toxinidir}/requirements.txt
   -r{toxinidir}/test-requirements.txt
 commands =