KNOX-2289 - Passing GatewayServer.getGatewayServices() to SimpleDescriptorHandler.handle() as it needs it to provision encryption query string password

[smolnar82]

What changes were proposed in this pull request?

(Please fill in changes proposed in this fix)

How was this patch tested?

Manually tested:

• redeployed Knox with my changes
• had a CM descriptor with two topologies: topology1 and topology2
• started Knox: the CM descriptor got picked up and generated into toplogies
• confirmed that:
  • the previous ERROR message - Failed to create a password for query string encryption for - did not show up in the log
  • the password was created

$ bin/knoxcli.sh list-alias --cluster topology2
Listing aliases for: topology2
encryptquerystring

1 items.

$ bin/knoxcli.sh list-alias --cluster topology1
Listing aliases for: topology1
encryptquerystring

1 items.

[risdenk]

Ha that explains something that I don't have to track down now:

2020-03-03 21:17:42,936 ERROR topology.simple (SimpleDescriptorHandler.java:handle(176)) - Failed to create a password for query string encryption for cdp-proxy-api.

[smolnar82]

I'd to rebase locally and submit a new PS due to changes in #287 (classes were re-factored out from DefaultTopologyService).