Minor PEP8 fixes
Add license text in ui/userdata/tests.py
Several ssh public keys fixes, Refs #1517
- Fixed paramiko key generation bug- Fixed fingerprint generation- Display fingerprint in UI
Replaced M2Crypto with paramiko for ssh key generation/validation
Updated settings names and document them in README.upgrade, Refs #1516
Moved userdata module inside ui application, Refs #1516
Fallback to error response if M2Crypto module cannot be imported
Configurable limit for per-user ssh keys, Refs #1517
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