Log Message:
py-apache-libcloud: update to 2.2.1

Libcloud 2.2.1:
Common
- Fix an issue with installation failing on some operating system and file
  systems combinations (e.g. ecryptfs layered on top of ext4) which don't
  support file names longer than 143 characters.

Compute
- [EC2] add g3 instance types
- [EC2] add 'end' to ec2 reserved_node
- Decrease sleep delay (from 1.5 to 0.2 seconds) inside paramiko client which
  is used to prevent busy waiting while waiting for data on the channel.
  This should cause deploy scripts which produce a lot of output in incremental
  manner to finish faster.
- Fix a regression in the Azure ARM driver which didn't allow custom storage
  URI suffix to be used with create_node.

Tests
- Make sure we normalize header values and cast all the numbers to strings in
  base connection classes used by tests.