cosmetic: Switch to consistent four-spaces indent; run autopep8

We had a mixture of tab and 4space based indenting, which is a bad
idea.  4space is the standard in python, so convert all our code to
that.  The result unfortuantely still shoed even more inconsistencies,
so I've decided to run autopep8 on the entire code base.

Change-Id: I4a4b1b444a2f43fab05fc5d2c8a7dd6ddecb5f07
diff --git a/pySim/jsonpath.py b/pySim/jsonpath.py
index 98dbd75..4dd838c 100644
--- a/pySim/jsonpath.py
+++ b/pySim/jsonpath.py
@@ -25,6 +25,7 @@
 # You should have received a copy of the GNU General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
+
 def js_path_find(js_dict, js_path):
     """Find/Match a JSON path within a given JSON-serializable dict.
     Args:
@@ -35,6 +36,7 @@
     jsonpath_expr = jsonpath_ng.parse(js_path)
     return jsonpath_expr.find(js_dict)
 
+
 def js_path_modify(js_dict, js_path, new_val):
     """Find/Match a JSON path within a given JSON-serializable dict.
     Args:
@@ -45,4 +47,3 @@
     jsonpath_expr = jsonpath_ng.parse(js_path)
     jsonpath_expr.find(js_dict)
     jsonpath_expr.update(js_dict, new_val)
-