Large amount of requests ending in a 502

[t-book]

Describe the bug
This PR introduces following behavior:

Whenever a layer is uploaded to GeoNode requests against 'geoserver/rest/styles' are fired for all existing styles. In case of a larger instance (Testinstance had 2500 layers/styles) this takes a while and hits harakiri limit.

Even if one raises the harakiri limit to not run into a 502 those requests slow down uploading of layers extremely.

Downgrading to 2.0.3 solved it. (Thanks @afabiani )

[t-book]

@afabiani

Unfortunately, I have to reopen here. The problem still exists with 2.0.4 when deleting a layer.
Delete triggers a single request for every existing style.
6 out of 2406 styles have no workspace within geoserver. All other reside in Workspace 'geonode'