use existing _pathlist() function to convert key and an array of values into AWS query param format instead of doing this in every function

Closes #319

Signed-off-by: Tomaz Muraus <tomaz@apache.org>
Fix ex_unpause_node in openstack

ex_unpause_node in the OpenStack driver was calling the 'pause' action instead of the 'unpause' action.

Closes #317

Signed-off-by: Tomaz Muraus <tomaz@apache.org>
Allow nodes to be launched into a specific subnet by adding subnet parameter to create_node() method of ec2 driver

Closes #318

Signed-off-by: Tomaz Muraus <tomaz@apache.org>
Bump version to 0.15.0.
LIBCLOUD-571 subnet-filters for ec2 driver

Closes #306

Signed-off-by: Tomaz Muraus <tomaz@apache.org>
LIBCLOUD-572 internet-gateways-filters for ec2 driver

Closes #307

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