multiversion: replace die() with print; exit(1);

When PHP die() is given a string, it would exit 0 which is not very nice
if one wants to test out whether the command ran properly.
This change replaces all die("message") calls by:

 print "message";
 exit( 1 );

Change-Id: Ia4910d223e67bbdb0bc89c9b66a123e0cb7ea340
Merge "multiversion: replace die() with print; exit(1);"