Add a script to run one command for all bwc tests (#931)

Currently, even we have bwc tests and data, to run bwc, we need
to copy and unzip data in opensearch, then run opensearch,
dashboards and cypress. This script will add more automation to
allow us use one command to run all the tests. Here is the cmd:

./scripts/bwctest-osd.sh
-o /path/to/opensearch.tar.gz
-d /path/to/opensearch-dashboards.tar.gz
-v versions
-b true/false

-o is the path to the tested opensearch. Here we need to rename
the folder to opensearch and zip it
-d is the path to the tested opensearch-dashboards. Also need to
rename the folder to opensearch-dashboards and zip it
-v is the optional version para. You can specify one version or
multiple versions like "odfe-1.1.0, osd-1.0.0". If no pass, it will
run all the versions defined in the script.
-b is the optional osd type para. If pass true, it will run osd bundle.
If pass false, it will run osd vanilla. The default is false.

update the usage section with new parameters
add license header and move the script in scripts folder

modify bwc test script:
1)use curl command to check the opensearch and dashboards status
2)create test groups to eliminate if clauses
3)modify var names
4)wrap each block into functions to make it more reusable
5)add more comments

clean out usage on port 5601
add test command and modify checking logic
fix license

Partically Resolved:
opensearch-project/opensearch-build#705

Signed-off-by: Anan Zhuang <ananzh@amazon.com>

package.json

@@ -41,6 +41,7 @@
     "osd": "node scripts/osd",
     "opensearch": "node scripts/opensearch",
     "test": "grunt test",
+    "test:bwc": "./scripts/bwctest-osd.sh",
     "test:jest": "node scripts/jest",
     "test:jest_integration": "node --no-deprecation scripts/jest_integration",
     "test:mocha": "node scripts/mocha",