Delete the SSH key generation command execution.

Instead of executing ssh-keygen command,
deploy the predefined SSH key for the jenkins user.

This commit refs #22.
Store the SSH public and secret key into the encrypted data bags.

Store the SSH public and secret key,
into the encrypted data bags.

Encrypted data bags can keep SSH secret key secret,
at least I believe so!

This commit refs #22.
Deploy the SSH key for jenkins user.

Make sure that the jenkins user has the same SSH key,
in order to git push or git pull.

This commit fixes #22.
Merge branch 'id/22' into dev