Auto generate AUTHORS file for glanceclient component.

Bug: 976267

Now that git commits are gated by CLA, we shouldn't enforce
committers to add an entry in AUTHORS file. The AUTHORS file
should be generated automatically, based on git commits.

This commit fixes the problem.

* AUTHORS
  Remove this file.

* .gitignore
  Add AUTHORS file.

* glanceclient/openstack/common/setup.py
  Sync changes from openstack-common.

* setup.py
  Generate AUTHORS file before creating the package.

* glanceclient/shell.py
  Pep8 fix.

* tests/test_authors.py
  Remove this test case.

Change-Id: I9e9d4da5ca3b147b483250dcf25a3b2a840123c2

glanceclient/openstack/common/setup.py

@@ -61,14 +61,21 @@ def parse_requirements(requirements_files=['requirements.txt',
                                            'tools/pip-requires']):
     requirements = []
     for line in get_reqs_from_files(requirements_files):
+        # For the requirements list, we need to inject only the portion
+        # after egg= so that distutils knows the package it's looking for
+        # such as:
+        # -e git://github.com/openstack/nova/master#egg=nova
         if re.match(r'\s*-e\s+', line):
             requirements.append(re.sub(r'\s*-e\s+.*#egg=(.*)$', r'\1',
                                 line))
-        elif re.match(r'\s*-f\s+', line):
-            pass
+        # such as:
+        # http://github.com/openstack/nova/zipball/master#egg=nova
         elif re.match(r'\s*https?:', line):
             requirements.append(re.sub(r'\s*https?:.*#egg=(.*)$', r'\1',
                                 line))
+        # -f lines are for index locations, and don't get used here
+        elif re.match(r'\s*-f\s+', line):
+            pass
         else:
             requirements.append(line)
 
@@ -78,11 +85,16 @@ def parse_requirements(requirements_files=['requirements.txt',
 def parse_dependency_links(requirements_files=['requirements.txt',
                                                'tools/pip-requires']):
     dependency_links = []
+    # dependency_links inject alternate locations to find packages listed
+    # in requirements
     for line in get_reqs_from_files(requirements_files):
+        # skip comments and blank lines
         if re.match(r'(\s*#)|(\s*$)', line):
             continue
+        # lines with -e or -f need the whole line, minus the flag
         if re.match(r'\s*-[ef]\s+', line):
             dependency_links.append(re.sub(r'\s*-[ef]\s+', '', line))
+        # lines that are only urls can go in unmolested
         elif re.match(r'\s*https?:', line):
             dependency_links.append(line)
     return dependency_links