[ci skip], add emptytest.py
[ci skip], modify print infomation in emptytest.py
[ci skip], modify information of print.
[Jenkins][ci skip] Create and save cpp-empty-test apk for autotest
[ci skip], modify apk path.
closed #4847, Find ant path from system first when ANT_ROOT is not set.
Merge pull request #6282 from shujunqiao/empty-test

[ci skip], add emptytest.py
Merge pull request #6289 from lmskater/create-save-apk

[Jenkins][ci skip] Create and save cpp-empty-test apk for autotest
[Jenkins][ci skip] Fix ftp home in upload_apk.sh
[Jenkins][ci skip] Fix ftp home in upload_apk.sh
Merge pull request #6294 from lmskater/fix-ftp-home

[Jenkins][ci skip] Fix ftp home in upload_apk.sh
Merge pull request #6293 from natural-law/issue4847

Find ant path from system first when ANT_ROOT is not set.