Merge pull request #586 from tremble/cleanup/elb

Cleanup ec2_elb*

SUMMARY
This effectively reverts ansible/ansible#30532
@wimnat originally tried to keep ec2_elb, ec2_elb_lb and their fact/info partners separate from elb_instance / elb_classic_lb so that when a boto3 migration was performed the API/return values could be changed.  We no longer have a 'preview' flag on the interface, so this is just causing duplication.

ec2_elb_info now has a boto3 based equivalent elb_classic_lb_info deprecate it so we can drop the old boto based module
elb_classic_lb was never rewritten, point it at amazon.aws.ec2_elb_lb so we only try and do the boto3 migration in one place
elb_instance was never rewritten, point ec2_elb at community.aws.elb_instance so we only try and do the boto3 migration in one place

Before we release 2.0.0 let's get this back to something vaguely consistent.
ISSUE TYPE

Feature Pull Request

COMPONENT NAME
ec2_elb
ec2_elb_lb
ec2_elb_info
elb_classic_lb
elb_classic_lb_info
ADDITIONAL INFORMATION

Reviewed-by: Jill R <None>
Reviewed-by: Markus Bergholz <git@osuv.de>