[embedding] Improve the code of embeddingAPI tests.

- Rename some test methods name
- Add judgment about one existence test
- Delete one unnecessary test case
- Improve the pack.sh shell

Impacted tests(approved): new 0, update 0, delete 1
Unit test platform: [Android]
Unit test result summary: pass 71, fail 17, block 4
Merge pull request #729 from zhuyongyong/yongzhu/embeddingAPI-tests/existTest

[embedding] Improve the code of embeddingAPI tests.