LIBCLOUD-566: Fix casing in defining keypair private key
Update CHANGES file to reflect fix of LIBCLOUD-566
Fixing flake8 error
Add new driver for Kili public cloud.

Kili public cloud is a public cloud provider in Africa powered by
OpenStack.
Add "timeout" argument to ParamikoSSHClient.run method.

If this argument is specified, run method will throw if the command doesn't
finish in the provded time period.
Add __repr__ and __str__ methods.
Fix various bugs and add various improvements:

- Fix typos in docstrings and comments
- Add import_key_pair_from_string to dummy compute driver.
- Fix ec2.import_key_pair_from_string for Python 3
- Fix publickey._to_md5_fingerprint for Python 3
- Fix publickey.get_pubkey_ssh2_fingerprint for Python 3
- ec2 driver: Make cidr_ips argument mandatory
- Add "floating IP" functions to the OpenStack provider

Closes #301

Signed-off-by: Tomaz Muraus <tomaz@apache.org>