ATLAS-5189: Encrypt postgres password

[chaitalicod]

What changes were proposed in this pull request?

Approach:-:
Encryption:
Use cputil.py tool to encrypt password for key "atlas.graph.storage.rdbms.jpa.hikari.password" which will be then stored in jceks file along with password and Atlas will decrypt using new method added as getDecryptedPassword and set it in hikari data source

Expectation:-:
Encrypt password for rdbms db
atlas.graph.storage.rdbms.jpa.hikari.username=atlas
atlas.graph.storage.rdbms.jpa.hikari.password=password(we should set it as ********)
1.When a user will add password property in application.properties manually we should encrypt the password and send it to postgres
we should avoid plaintext password

How was this patch tested?

Created jceks file using below command
-k is for key
-p password to encrypt
-f jceks file path

./cputil.py -k atlas.graph.storage.rdbms.jpa.hikari.password -p password -f jceks://file/home/project/forkbranch/atlas/rdbms.jceks

You should get below message
file:/home/project/forkbranch/atlas (exists=false, cwd=file:/home/chaitali/project/forkbranch/atlas/distro/target/apache-atlas-3.0.0-SNAPSHOT-bin/apache-atlas-3.0.0-SNAPSHOT/bin)

Assign your provider path like below in atlas-application.properties file
hadoop.security.credential.provider.path=jceks://file/home/chaitali/project/forkbranch/atlas/rdbms.jceks

Assign password in * format to this hikari password property
atlas.graph.storage.rdbms.jpa.hikari.password=********

Please note it should be 8 * specifically