maven-helper: look for snapshot versions in Sonatype first

Some of our projects migrated from the ImageJ Maven repositories to OSS
Sonatype. These will have obsolete snapshot versions still living in
the ImageJ Maven repository, so let's check with our Sonatype mirror
first, before looking at the ImageJ Maven repository.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>

Author: dscho

maven-helper.sh

@@ -8,11 +8,11 @@ set -e
 
 root_url () {
 	test snapshots != "$2" || {
-		if curl -fs http://maven.imagej.net/content/repositories/snapshots/"$1"/ > /dev/null 2>&1
+		if curl -fs http://maven.imagej.net/content/repositories/sonatype-snapshots/"$1"/ > /dev/null 2>&1
 		then
-			echo http://maven.imagej.net/content/repositories/snapshots
-		else
 			echo http://maven.imagej.net/content/repositories/sonatype-snapshots
+		else
+			echo http://maven.imagej.net/content/repositories/snapshots
 		fi
 		return
 	}