PEP 8 fixes

Added  E402 to the ignore errors list.
E402 is "module level import not at top of file"
and ignoring since settings_manager.py needs to modify
the sys.path before importing certain modules.
Since the default ignore list is not used anymore,
rules E121,E123,E126,E226,E24,E704,W503 are now enforced.
Looking at those rules, I believe we should enforce them.
Note E121,E123,E126,E226,E24,E704,W503 are all in the default
ignore list, so if no ignore list is provided in the
setup.cfg these errors are ignored.

from pycodestyle --help

--ignore=errors      skip errors and warnings (e.g. E4,W) (default:
                     E121,E123,E126,E226,E24,E704,W503)

Change-Id: I0f64535eb4b4ba471466c8c9c3dbda1f8b33f702
Signed-off-by: Gunnar Mills <gmills@us.ibm.com>
diff --git a/setup.py b/setup.py
index 92b7847..a411807 100644
--- a/setup.py
+++ b/setup.py
@@ -18,6 +18,7 @@
             f.write('SETTINGS=\\\n')
             pprint.pprint(data, stream=f)
 
+
 setup(
     name='phosphor-settings',
     version='1.0',