Improve a logic to select whether SSH key or Username

[jeonghanlee]

@shroffk This is our try to improve the logic behind your mind, which we (@jeonghanlee and
@Sangil-Lee ) figured out. I think your mind is brilliant ;)

We tested the following both cases:

Username

In alarm_config_logger.properties,

remote.location=https://git_repo/...
use_ssh_keys = false
username = aaa
password = bbb

SSH Key

remote.location=git@git_repo/...
use_ssh_keys = true

In this case, we also rename .ssh folder, and saw SshException in a log. After reverting to .ssh, everything worked well.

Please let me know what you think.