Cleanup test farm tests and add test_sdists (#4089)

* add get_certbot_version.sh

* Use get_certbot_version.sh in build.py

* make test_leauto_upgrades.sh more robust

* auto upgrades break tests

* OCSP experimental is not needed anymore

* Add test_sdists.sh

* Use LE_AUTO_VERSION, not repo version

* install OS deps earlier

* use readlink not realpath

* undo changes to build.py

* Factor out version code from build.py

* Use version.py in test_sdists

* Remove get_certbot_version

* workaround setuptools breakage

letsencrypt-auto-source/build.py

@@ -8,26 +8,13 @@ other, special definitions.
 """
 from os.path import abspath, dirname, join
 import re
-from sys import argv
+
+from version import certbot_version, file_contents
 
 
 DIR = dirname(abspath(__file__))
 
 
-def certbot_version(build_script_dir):
-    """Return the version number stamped in certbot/__init__.py."""
-    return re.search('''^__version__ = ['"](.+)['"].*''',
-                     file_contents(join(dirname(build_script_dir),
-                                        'certbot',
-                                        '__init__.py')),
-                     re.M).group(1)
-
-
-def file_contents(path):
-    with open(path) as file:
-        return file.read()
-
-
 def build(version=None, requirements=None):
     """Return the built contents of the letsencrypt-auto script.
 

letsencrypt-auto-source/version.py

@@ -0,0 +1,28 @@
+#!/usr/bin/env python
+"""Get the current Certbot version number.
+
+Provides simple utilities for determining the Certbot version number and
+building letsencrypt-auto.
+
+"""
+from __future__ import print_function
+from os.path import abspath, dirname, join
+import re
+
+
+def certbot_version(build_script_dir):
+    """Return the version number stamped in certbot/__init__.py."""
+    return re.search('''^__version__ = ['"](.+)['"].*''',
+                     file_contents(join(dirname(build_script_dir),
+                                        'certbot',
+                                        '__init__.py')),
+                     re.M).group(1)
+
+
+def file_contents(path):
+    with open(path) as file:
+        return file.read()
+
+
+if __name__ == '__main__':
+    print(certbot_version(dirname(abspath(__file__))))