Remove ssh-conf from buildout. The sftp api should do everything necessary.
Remove sftp helper from services. It should go together with other ssh helpers.
Fixes #394.

Fixes the main bug. Do a little more than just fix #394 by refactoring and cleaning up.
fix a minor typo bug in share_helpers
Merge pull request #462 from schakrava/issue#394

Issue#394
add low level helper code to add ssh pub key for a user.
Merge branch 'master' into Mchakravartula-issue#463_add_optional_ssh_keys_for_userCreation
Update user model to store ssh pub key.
Update user api to support ssh pub key.