Improve checkComposites.sh script

Do not rely on file access by default, get last 5 repos from
download.eclipse.org/releases if no argument is given

Change-Id: Idefb35a86b39ea259640c8aadaa334a346c8d8e1
Signed-off-by: Frederic Gurr <frederic.gurr@eclipse-foundation.org>
1 file changed