use std importer configuration keys; pass max bandwidth & concurrency for downloads.
remove unused import.
Add model test.
updated node unit tests.
Merge branch 'master' into nodes-bandwidth-concurrency
add bandwidth and concurrency options support to nodes extensions.
remove unused import
add --max-downloads, max-speed to nodes command user-guide.
better user-guide formatting.
Discontinue removing extra distributors during node sync.
980506 - Fix creation of pulp cert file to have permission 600
Merge pull request #548 from pulp/nodes-bandwidth-concurrency

Support passing max-bandwidth and max-concurrency options for node synchronization.
Merge pull request #559 from pulp/barnabycourt-980506

980506 - Fix creation of pulp cert file to have permission 600
Merge branch 'master' into nodes-permit-extra-distributors

Conflicts:
	nodes/child/pulp_node/handlers/model.py
Merge pull request #557 from pulp/nodes-permit-extra-distributors

Discontinue removing extra distributors during node sync.
980147- Create create certificates that are not world readable using pulp-qpid-ssl-cfg
976561 - removed superfluous re-fetching of collection we already have a handle to
976561 - updated the list of decorated collection methods to match the Collection object in 2.1.1
fixed names of some of the new decorated methods
chnaged retry decorator to not look up or rely on the presence of "self"