Merge branch 'p1' into 'master'

Fix pubkey extraction on update

Replacement of !86.

Fix pubkey extraction in case of non-empty _JAVA_OPTIONS. Fixes #133.

I didn't actually run the test suite (it looks like there are some preparations to be done for that), but I checked the commands from `test_fdroid_popen_stderr_redirect` in ipython.

See merge request !103

fdroidserver/update.py

@@ -726,7 +726,8 @@ def extract_pubkey():
                          '-alias', config['repo_keyalias'],
                          '-keystore', config['keystore'],
                          '-storepass:file', config['keystorepassfile']]
-                        + config['smartcardoptions'], output=False)
+                        + config['smartcardoptions'],
+                        output=False, stderr_to_stdout=False)
         if p.returncode != 0 or len(p.output) < 20:
             msg = "Failed to get repo pubkey!"
             if config['keystore'] == 'NONE':