Fix tox env ordering issue (#1457)

- flake8 and docs depend on codegen
- test depends on installers (for `install_local_wheel.py --driver nitclk`), not codegen
- pkg depends on installers

Author: sbethur

tox-travis.ini

@@ -140,8 +140,11 @@ deps =
 
 depends =
     codegen: py38-clean
-    test: py38-codegen
     installers: py38-codegen
+    flake8: py38-codegen
+    docs: py38-codegen
+    test: py38-installers
+    pkg: py38-installers
 
 whitelist_externals =
     build_test: mv

tox.ini

@@ -140,8 +140,11 @@ deps =
 
 depends =
     codegen: py38-clean
-    test: py38-codegen
     installers: py38-codegen
+    flake8: py38-codegen
+    docs: py38-codegen
+    test: py38-installers
+    pkg: py38-installers
 
 whitelist_externals =
     build_test: mv