`--no-seal-check` option still exist in `--full-help` and launching the kernel with this option, the kernel launches as normal

[MiaoShi09]

os & version: ubuntu 16.04
branch: dev_rf
commit: 8fe44d7

---

Expected: the option --no-seal-check has been removed from cmds.

1. --no-seal-check option will be shown in --full-help and --help;
   2 the kernel takes --no-seal-check as an invalid option.

Actual: 1. --no-seal-check exist in --full-help and --help list;
2. able to launch a kernel with -no-seal-check option; no information shows on the kernel log that --no-seal-check is an invalid option.

ion@aion11:~/miao_ws/aionr_dev_rf/package/aionr-0.2.4-20190611$ ./mastery.sh --base-path=../base --no-seal-check
Picked up JAVA_TOOL_OPTIONS: -Dfile.encoding=UTF8
2019-06-11 13:58:40 Config path /home/aion/miao_ws/aionr_dev_rf/package/aionr-0.2.4-20190611/mastery/mastery.toml
2019-06-11 13:58:40 Genesis spec path /home/aion/miao_ws/aionr_dev_rf/package/aionr-0.2.4-20190611/mastery/mastery.json
2019-06-11 13:58:40 Keys path /home/aion/miao_ws/aionr_dev_rf/package/aionr-0.2.4-20190611/../base/keys/mastery
2019-06-11 13:58:40 DB path /home/aion/miao_ws/aionr_dev_rf/package/aionr-0.2.4-20190611/../base/chains/mastery/db/f8ae64b686ab2cc6
2019-06-11 13:58:40 
             _____    ____    _   _ 
     /\     |_   _|  / __ \  | \ | |
    /  \      | |   | |  | | |  \| |
   / /\ \     | |   | |  | | | . ` |
  / ____ \   _| |_  | |__| | | |\  |
 /_/    \_\ |_____|  \____/  |_| \_|


2019-06-11 13:58:40 Starting Aion(R)/v0.2.4.8fe44d7/x86_64-linux-gnu/rustc-1.28.0
2019-06-11 13:58:40 Configured for Mastery using POWEquihashEngine engine
2019-06-11 13:58:41 Genesis hash: 1878e70918712e2f4cd9c4f1cfba6ff776b407fcf8ae64b686ab2cc673c18cb5
2019-06-11 13:58:41 State DB configuration: archive
2019-06-11 13:58:41 Wallet API is disabled.
2019-06-11 13:58:41 local node loaded: 8f7e101d-7dba-4aa0-ba2e-57d6f70bb552@0.0.0.0:30302
2019-06-11 13:58:46 Listening on: 0.0.0.0:30302
2019-06-11 13:58:46 ======================================================== Sync Statics =========================================================
2019-06-11 13:58:46 Best block number: 2552736, hash: e94f…96cf
2019-06-11 13:58:46 Network Best block number: 0, hash: 0000…0000
2019-06-11 13:58:46 Max staged block number: 0
2019-06-11 13:58:46 Sync speed: 0 blks/sec
2019-06-11 13:58:46 Total/Connected/Active peers: 0/0/0
2019-06-11 13:58:46 -------------------------------------------------------------------------------------------------------------------------------
2019-06-11 13:58:46       Total Diff    Blk No.    Blk Hash                 Address                 Revision      Conn  Seed  LstReq No.       Mode
2019-06-11 13:58:46 -------------------------------------------------------------------------------------------------------------------------------
2019-06-11 13:58:46 -------------------------------------------------------------------------------------------------------------------------------
2019-06-11 13:58:51 New block #2552737 4de7…d735, with 1 txs added in chain, time elapsed: 30.645459ms.
2019-06-11 13:58:51 New block #2552738 3765…acba, with 0 txs added in chain, time elapsed: 30.522546ms.