Add scripts for ALB TG reg/dereg from EC2 instance

added bash scripts:

bin/ec2-tg-info
bin/ec2-tg-register
bin/ec2-tg-deregister

added shell functions in .profile.d/elbv2_functions.sh:

ec2-instance-tags
ec2-metadata-tags
elb-lb-list-arn
elb-tg-list-arn
elb-lb-show-tags
elb-tg-show-tags
elb-lb-list-for-instance

added functions to .profile.d/ssm_functions.sh

ssm-path-from-tags

Add more elbv2 functions

ec2-instance-id()
elb-tg-show-attributes()
elb-tg-modify-attributes()
elb-tg-register()
elb-tg-deregister()