JCLOUDS-213: Fixing SoftLayer support

Forward port of f278450355bbaa95c841c2f857a528091b90d723, updated for 1.7.0 naming convention (Api instead of *Client)

Conflicts:  (All are just around the naming change mentioned above.)
	providers/softlayer/src/main/java/org/jclouds/softlayer/compute/config/SoftLayerComputeServiceContextModule.java
	providers/softlayer/src/main/java/org/jclouds/softlayer/features/AccountAsyncClient.java
	providers/softlayer/src/main/java/org/jclouds/softlayer/features/AccountClient.java
	providers/softlayer/src/test/java/org/jclouds/softlayer/features/BaseSoftLayerApiLiveTest.java
	providers/softlayer/src/test/java/org/jclouds/softlayer/features/ProductPackageApiLiveTest.java
	providers/softlayer/src/test/java/org/jclouds/softlayer/features/VirtualGuestApiLiveTest.java