Do not call exit 1 when loaded with source command

BUG: 13754552
Change-Id: I3d5e4c0786547521325405100c175dd1b21754df

native/jni/run-tests.sh

@@ -18,7 +18,7 @@ echo "Usage:" 1>&2
 echo "    source $0" 1>&2
 echo "  or" 1>&2
 echo "    . $0" 1>&2
-exit 1
+if [[ ${BASH_SOURCE[0]} != $0 ]]; then return; else exit 1; fi
 fi
 
 pushd $PWD > /dev/null

tools/dicttool/tests/etc/test-dicttool.sh

@@ -18,7 +18,7 @@ echo "Usage:" 1>&2
 echo "    source $0" 1>&2
 echo "  or" 1>&2
 echo "    . $0" 1>&2
-exit 1
+if [[ ${BASH_SOURCE[0]} != $0 ]]; then return; else exit 1; fi
 fi
 
 find out -name "dicttool_aosp*" -exec rm -rf {} \; > /dev/null 2>&1