Use pg_restore -O during 1-to-2 conversion

Less likely to cause permissions problems when processing dump
files on another system.

Signed-off-by: Shawn O. Pearce <sop@google.com>

devutil/1-to-2.sh

@@ -34,7 +34,7 @@ g2="$out/bin/gerrit2.sh --config=$gscfg"
 
 dropdb $dstdb
 createdb -E UTF-8 -O $user $dstdb || exit
-pg_restore -d $dstdb $v1data || exit
+pg_restore -O -d $dstdb $v1data || exit
 $g2 CreateSchema || exit
 psql -f devutil/import_gerrit1.sql $dstdb || exit
 psql -f $cfgsql $dstdb || exit