note slow tests, ensure we generate sisu indexes for components
gen sisu index for components and testsupport
update autoshard configuration, same as pro has
move cargo tests to slow shard
normalize and document usage of nexus.version, nexus-oss.version and nexus-pro.version
Remove UpdateSiteMirrorTask from nexus configuration as it is not used and is confusing waitForAllTasksToStop which will wait for that task to be executed

Since the task is not executed the waitForAllTasksToStop server side will wait for about 2 min before giving up, slowing down the IT

Signed-off-by: Alin Dreghiciu <adreghiciu@gmail.com>
Merge remote-tracking branch 'origin/master' into remove-hc3