Remove use_mirrors from pip module

PyPI moved to a CDN on 2013-05-26, so mirrors are now largely
unnecessary and pip removed the functionality in 1.5. More importantly
(and why I wrote this request): on 2014-02-15 the mirror directory was
taken offline, so mirrors may not work anymore even for pip versions
that support them.

library/packaging/pip

@@ -70,15 +70,6 @@ options:
         C(virtualenv2), C(~/bin/virtualenv), C(/usr/local/bin/virtualenv).
     required: false
     default: virtualenv
-  use_mirrors:
-    description:
-      - Whether to use mirrors when installing python libraries.  If using
-        an older version of pip (< 1.0), you should set this to no because
-        older versions of pip do not support I(--use-mirrors).
-    required: false
-    default: "yes"
-    choices: [ "yes", "no" ]
-    version_added: "1.0"
   state:
     description:
       - The state of module
@@ -119,7 +110,7 @@ EXAMPLES = '''
 # Install (Bottle) python package on version 0.11.
 - pip: name=bottle version=0.11
 
-# Install (MyApp) using one of the remote protocols (bzr+,hg+,git+,svn+) or tarballs (zip, gz, bz2) (pip) supports. You do not have to supply '-e' option in extra_args. For these source names, (use_mirrors) is ignored and not applicable.
+# Install (MyApp) using one of the remote protocols (bzr+,hg+,git+,svn+). You do not have to supply '-e' option in extra_args.
 - pip: name='svn+http://myrepo/svn/MyApp#egg=MyApp'
 
 # Install (Bottle) into the specified (virtualenv), inheriting none of the globally installed modules
@@ -234,7 +225,6 @@ def main():
     name = module.params['name']
     version = module.params['version']
     requirements = module.params['requirements']
-    use_mirrors = module.params['use_mirrors']
     extra_args = module.params['extra_args']
     chdir = module.params['chdir']
 
@@ -275,7 +265,6 @@ def main():
     pip = _get_pip(module, env, module.params['executable'])
 
     cmd = '%s %s' % (pip, state_map[state])
-    cmd_opts = None
     
     # If there's a virtualenv we want things we install to be able to use other
     # installations that exist as binaries within this virtualenv. Example: we 
@@ -287,25 +276,11 @@ def main():
     if env:
         path_prefix="/".join(pip.split('/')[:-1])
 
+    # Automatically apply -e option to extra_args when source is a VCS url. VCS
+    # includes those beginning with svn+, git+, hg+ or bzr+
     if name:
-        # pip can accept a path to a local project or a VCS url beginning
+        if name.startswith('svn+') or name.startswith('git+') or \
-        # with svn+, git+, hg+, or bz+ and these sources usually do not qualify
-        # --use-mirrors. Furthermore, the -e option is applied only when
-        # source is a VCS url. Therefore, we will have branch cases for each
-        # type of sources.
-        #
-        # is_vcs includes those begin with svn+, git+, hg+ or bzr+
-        # is_tar ends with .zip, .tar.gz, or .tar.bz2
-        is_vcs = False
-        is_tar = False
-        is_local_path = False
-        if name.endswith('.tar.gz') or name.endswith('.tar.bz2') or name.endswith('.zip'):
-            is_tar = True
-        elif name.startswith('svn+') or name.startswith('git+') or \
                 name.startswith('hg+') or name.startswith('bzr+'):
-            is_vcs = True
-        # If is_vcs=True, we must add -e option (we assume users won't add that to extra_args).
-        if is_vcs:
             args_list = []  # used if extra_args is not used at all
             if extra_args:
                 args_list = extra_args.split(' ')
@@ -314,17 +289,6 @@ def main():
                 # Ok, we will reconstruct the option string
                 extra_args = ' '.join(args_list)
 
-        if name.startswith('.') or name.startswith('/'):
-            is_local_path = True
-        # for tarball or vcs source, applying --use-mirrors doesn't really make sense
-        is_package = is_vcs or is_tar or is_local_path       # just a shortcut for bool
-
-        if cmd_opts is None:
-            cmd_opts = _get_cmd_options(module, '%s %s' % (pip, state_map[state]))
-
-        if not is_package and state != 'absent' and use_mirrors and '--use-mirrors' in cmd_opts:
-            cmd += ' --use-mirrors'
-
     if extra_args:
         cmd += ' %s' % extra_args
     if name: