Upgrade to .net core 2.0

[andiexer]

finally, microsoft released .net core 2.0 last week. new api's available, 20% more performance. due the new (or old available 80k) api's there should be more compatibility to old libraries which we maybe could use.

advantages:

• easier to target linux (our case)
• also RHEL supports fully .net core -> openshift scenario
• performance boost about 20%

.net core 2.0 announcment

what we need to do do get this work (brainstorming):

• update solution targetframework to netstandard2.0

• update docker images (i think we already use the latest tag -> this points default to 2.0 since yesterday)

• [x] Migrate BuildingBlocks to .NetStandard2.0

• [x] Migrate Asp.Net Core projects from 1.1 to 2.0

[andiexer]

today I found finally the time to migrate the solution to asp.net core 2.0 (see branch aspnetcore2.0) The upgrade was pretty smooth until RawRabbit came into play.

• RawRabbit isn't comptabile with netcore2.0 at the moment.

Actually we do not have much implemented with it. Maybe change the library?