Artifactory Migration Snapshot Location (#1901)

Don't store snapshots in a different groupID. Needed for downstream
tooling.

Signed-off-by: Danno Ferrin <danno.ferrin@gmail.com>

build.gradle

@@ -576,7 +576,7 @@ distZip {
 publishing {
   publications {
     distArtifactory(MavenPublication) {
-      groupId (version.contains('SNAPSHOT') ? 'SNAPSHOT' : '.')
+      groupId = '.'
       version = project.version
       artifactId = 'besu'
       artifact("$buildDir/distributions/besu-${project.version}.zip")