Fix a few issues reported by Flake8

Also:

 * Imports in service_keywords.py were reordered.

 * A comment in op_faker.py was slightly changed.

@@ -47,7 +47,7 @@ def create_fake_doc():
 
 def test_tender_data(intervals, periods=("enquiry", "tender")):
     now = get_now()
-    value_amount = round(random.uniform(3000, 250000000000), 2) #max value equals to budget of Ukraine in hryvnias
+    value_amount = round(random.uniform(3000, 250000000000), 2)  # max value equals to budget of Ukraine in hryvnias
     data = {
         "mode": "test",
         "submissionMethodDetails": "quick",
@@ -211,7 +211,7 @@ def test_question_answer_data():
 
 def test_complaint_data(lot=False):
     data = munchify({
-        "data" : {
+        "data": {
             "author": fake.procuringEntity(),
             "description": fake.description(),
             "title": fake.title()
@@ -339,14 +339,15 @@ def test_bid_params():
         ]
     })
 
+
 def test_bid_value(max_value_amount):
     return munchify({
-                "value": {
-                    "currency": "UAH",
-                    "amount": round(random.uniform(1, max_value_amount), 2),
-                    "valueAddedTaxIncluded": True
-                }
-            })
+        "value": {
+            "currency": "UAH",
+            "amount": round(random.uniform(1, max_value_amount), 2),
+            "valueAddedTaxIncluded": True
+        }
+    })
 
 
 def test_supplier_data():

@@ -108,8 +108,8 @@ class OP_Provider(BaseProvider):
         Generate a random item for openprocurement tenders
 
         :param cpv_group: gives possibility to generate items
-            from one cpv group. Cpv group is three digits in the beginning
-            of each cpv id.
+            from a specific cpv group. Cpv group is three digits
+            in the beginning of each cpv id.
         """
         if cpv_group is None:
             item_base_data = self.random_element(self.items_base_data)

 # -*- coding: utf-8 -
+from .local_time import get_now, TZ
 from copy import deepcopy
 from datetime import timedelta
 from dateutil.parser import parse
 from dpath.util import new as xpathnew
+from haversine import haversine
 from iso8601 import parse_date
 from json import load
 from jsonpath_rw import parse as parse_path
 from munch import fromYAML, Munch, munchify
-from restkit import request
 from robot.errors import ExecutionFailed
 from robot.libraries.BuiltIn import BuiltIn
 from robot.output import LOGGER
 from robot.output.loggerhelper import Message
-from haversine import haversine
-from math import radians, cos, sin, asin, sqrt
 # These imports are not pointless. Robot's resource and testsuite files
 # can access them by simply importing library "service_keywords".
 # Please ignore the warning given by Flake8 or other linter.
@@ -48,9 +47,10 @@ from .initial_data import (
     test_tender_data_openeu,
     test_tender_data_openua
 )
-from .local_time import get_now, TZ
-import os
 from barbecue import chef
+from restkit import request
+# End of non-pointless imports
+import os
 import re
 
 NUM_TYPES = (int, long, float)
@@ -422,6 +422,7 @@ def get_object_index_by_id(data, object_id):
         index += 1
     return index
 
+
 # GUI Frontends common
 def add_data_for_gui_frontends(tender_data):
     now = get_now()