Add retry for ssh connection to EC2 instance

[ckunki]

Currently if EC2 instance has not completed startup ssh connection fails with

fatal: [ec2-3-70-126-165.eu-central-1.compute.amazonaws.com]: UNREACHABLE! => {"changed": false, "msg": "Failed to connect to the host via ssh: ssh: connect to host ec2-3-70-126-165.eu-central-1.compute.amazonaws.com port 22: Connection timed out", "unreachable": true}
[09:14:25] ERROR edss-setup - Install dependencies failed. run_setup_ec2_and_install_dependencies.py:59

Additionally log message should be formatted differently to allow easier copy and paste without the reference to position in the source code.
Currently:

INFO edss-setup - You can now login to the ec2 machine with 'ssh -i /tmp/tmp9yasuz8a
run_setup_ec2_and_install_dependencies.py:62
[email protected]'

Proposal: Use Print instead of log

User needs to retry

Proposal:

• Add retry mehcanism, see ITDE