Moved Watcher doc plugin outside main package

In this changeset, I renamed watcher/doc.py file as
doc/ext/term.py which subsequently does not get scanned for coverage
anymore. Hence, we can close this bug.

Change-Id: I9d700da6569b464ce71085fe78002521555002b9
Closes-bug: #1527163

doc/source/conf.py

@@ -11,8 +11,19 @@
 # implied.
 # See the License for the specific language governing permissions and
 # limitations under the License.
+
+import sys
+import os
+
 from watcher import version as watcher_version
 
+# If extensions (or modules to document with autodoc) are in another directory,
+# add these directories to sys.path here. If the directory is relative to the
+# documentation root, use os.path.abspath to make it absolute, like shown here.
+sys.path.insert(0, os.path.abspath('../../'))
+sys.path.insert(0, os.path.abspath('../'))
+sys.path.insert(0, os.path.abspath('./'))
+
 # -- General configuration ----------------------------------------------------
 
 # Add any Sphinx extension module names here, as strings. They can be
@@ -26,7 +37,7 @@ extensions = [
     'sphinxcontrib.pecanwsme.rest',
     'stevedore.sphinxext',
     'wsmeext.sphinxext',
-    'watcher.doc',
+    'ext.term',
 ]
 
 wsme_protocols = ['restjson']