Updated coverage related options to project

- Added .coveragerc file to project, this file is utilized
  to provide variuos various options like while running coverage.
- Used the .coveragerc file available in trove project.
- Updated tox.ini to show the calculated coverage results.

Change-Id: I9cc72766ab5a3ca48c60089062f37123dafc2850
Closes-Bug: #1453100
Closes-Bug: #1453101

.coveragerc

@@ -0,0 +1,29 @@
+# .coveragerc to control coverage.py
+[run]
+branch = True
+
+source=troveclient
+omit=troveclient/tests*,troveclient/compat/tests*,troveclient/openstack*
+
+[report]
+# Regexes for lines to exclude from consideration
+exclude_lines =
+    # Have to re-enable the standard pragma
+    pragma: no cover
+
+    # Don't complain about missing debug-only code:
+    def __repr__
+    if self\.debug
+
+    # Don't complain if tests don't hit defensive assertion code:
+    raise AssertionError
+    raise NotImplementedError
+
+    # Don't complain if non-runnable code isn't run:
+    if 0:
+    if __name__ == .__main__.:
+
+ignore_errors = False
+
+[html]
+directory=cover

tox.ini

@@ -25,7 +25,11 @@ commands = flake8
 commands = {posargs}
 
 [testenv:cover]
-commands = python setup.py testr --coverage --testr-args='{posargs}'
+commands =
+    coverage erase
+    python setup.py testr --coverage --testr-args='{posargs}'
+    coverage html
+    coverage report
 
 [testenv:docs]
 commands =