propigate ssh-options everywhere ssh caching is used

* sync: Use the ssh-options git config when doing git pull and push.
* remotedaemon: Use the ssh-options git config.

Note that the rename env var means that if a new git-annex calls an old one
for git-annex ssh, or a new calls an old, nothing much will go wrong;
just ssh caching won't happen.

doc/bugs/ssh-options_seems_to_be_ignored.mdwn

@@ -43,3 +43,6 @@ Debian testing 5.20141125
 
 # End of transcript or log.
 """]]
+
+> [[fixed|done]], ssh-options is now propigated everywhere that ssh
+> connection caching goes --[[Joey]]