Security CLI commands

<input> - will have to be provided by users, no autocomplete

[input] - autocomplete will be available

Function	Existing Command	Proposed Change	Comments
Grant	security grant entity <entity-id> principal-type <principal-type> principal-name <principal-name> actions <actions>	grant actions <actions> on entity <entity-id> to [principal-type] <principal-name>	Should we make these role-based only like Sentry? Or allow users and groups too?
Revoke	security revoke entity <entity-id> principal-type <principal-type> principal-name <principal-name> actions <actions>	revoke actions <actions> on entity <entity-id> from [principal-type] <principal-name>
Check Access	security access entity <entity-id> principal-type <principal-type> principal-name <principal-name> actions <actions>	Remove.
Create Role	-	create role <role-name>
Drop Role	-	drop role <role-name>
List Roles	-	list roles
Add role to group	-	add role <role-name> to group <group-name>	Q: Should we allow adding roles to users as well? Sentry only supports adding to groups.
Remove role from group	-	remove role <role-name> from group <group-name>
List roles for group	-	list roles for group <group-name>
List privileges for role	-	list privileges for role <role-name>