Log Message:
py-softlayer: updated to 5.6.4

[5.6.4]
Dedicated host cancel, cancel-guests, list-guests
added createDate and modifyDate parameters to sg rule-list
Fixed slcli subnet list
Fixed documentation link in image manager
Added description to slcli order

[5.6.3]
Updated urllib3 and requests libraries due to CVE-2018-18074
Fixed an ordering bug
Updated release process and fab-file

[5.6.0]
Support for Reserved Capacity
slcli vs capacity create
slcli vs capacity create-guest
slcli vs capacity create-options
slcli vs capacity detail
slcli vs capacity list
Fix post_uri parameter name on docstring
Fixed suspend cloud server order.
Update to use click 7
Add export/import capabilities to/from IBM Cloud Object Storage to the image \ 
manager as well as the slcli.