Shouldn't be pulling any snapshot dependencies from
maven.hudson-labs.org

add a workaround ONLY for maven2 builds

UpdateCenter is modified to use PageDecorator in
862b79cc (and main.jelly removed in
3bf4b46b)

[HUDSON-8395] M2 POMs aren't parsed if there is a M3 control error like an invalid scope in a plugin dep.
use different validation level depending on maven version used.

add hudson labs snapshot repo for embedder

upgrade hudson-maven-embedder to last SNAPSHOT

getting garbled.