Minor tox cleanup for linters and pep8

linters yamllint target was excluding a folder that did not exist
pep8 was not invoking flake8, and was not including hacking which
pulls in additional checks.

Story: 2004515
Task: 28966
Change-Id: I0268f685e4292d93c5ff6014b150b25bfe9cd583
Signed-off-by: Al Bailey <Al.Bailey@windriver.com>

tox.ini

@@ -23,19 +23,24 @@ commands =
          -name \*.sh                          \
          -print0 | xargs -0 bashate -iE006 -v"
   bash -c "find {toxinidir}        \
-            \( -name middleware/io-monitor/recipes-common/io-monitor/io-monitor/io_monitor/test-tools/yaml/* -prune \) \
+            \( -name .tox -prune \)         \
-            -o \( -name .tox -prune \)         \
             -o -type f -name '*.yaml'       \
             -print0 | xargs -0 yamllint"
 
+[flake8]
+exclude=.tox
+# H102 Apache 2.0 license header not found
+ignore=H102
+
 [testenv:pep8]
 basepython = python3
 usedevelop = False
 skip_install = True
+# hacking pins the version of flake8
 deps =
-    pep8
+    hacking!=0.13.0,<0.14,>=0.12.0 
 commands =
-    pep8
+    flake8
 
 [testenv:venv]
 basepython = python3