Set flake8-import-order version to 0.17.1

Full py3 compatible version.
Add all Python3 modules to stdlib list.
Also includes fix to an enum34 dependency bug.

Change-Id: I26f38e18ce5c1c61aadbc1590a79c97e7b3c4ab4

lower-constraints.txt

@@ -11,6 +11,7 @@ dulwich==0.15.0
 extras==1.0.0
 fixtures==3.0.0
 flake8==2.5.5
+flake8-import-order==0.17.1
 future==0.16.0
 hacking==3.0.0
 imagesize==0.7.1

test-requirements.txt

@@ -6,7 +6,7 @@ hacking>=3.0.0,<3.1.0 # Apache-2.0
 
 coverage!=4.4,>=4.0 # Apache-2.0
 doc8>=0.6.0 # Apache-2.0
-flake8-import-order>=0.13 # LGPLv3
+flake8-import-order>=0.17.1 # LGPLv3
 python-subunit>=1.0.0 # Apache-2.0/BSD
 sphinx!=1.6.6,!=1.6.7,!=2.1.0,>=1.6.2 # BSD
 openstackdocstheme>=1.20.0 # Apache-2.0

tox.ini

@@ -63,7 +63,6 @@ application-import-names = virtualbmc
 exclude =  .venv,.git,.tox,dist,doc,*lib/python*,*egg,build
 max-complexity=17
 
-
 [testenv:lower-constraints]
 deps =
   -c{toxinidir}/lower-constraints.txt