tests: turn off unneeded debug logging during APK copying

The whole process of finding and copying APKs can be very verbose, so turn
of the bash verbose logging during that process.

tests/run-tests

@@ -1,7 +1,7 @@
 #!/bin/bash
 
-set -e
-set -x
+set -e # quit script on error
+set -x # show each command as it is executed
 
 echo_header() {
     echo "=============================================================================="
@@ -9,6 +9,7 @@ echo_header() {
 }
 
 copy_apks_into_repo() {
+    set +x
     for f in `find $APKDIR -name '*.apk' | grep -F -v -e unaligned -e unsigned`; do
         name=$(basename $(dirname `dirname $f`))
         apk=`aapt dump badging "$f" | sed -n "s,^package: name='\(.*\)' versionCode='\([0-9][0-9]*\)' .*,\1_\2.apk,p"`
@@ -19,6 +20,7 @@ copy_apks_into_repo() {
                 rsync -axv $f $1/repo/$apk # rsync if hard link is not possible
         fi
     done
+    set -x
 }
 
 create_fake_android_home() {