Description of problem:
Customerwant to clone git repository from their github to business central over ssh.

According to the following document,

https://help.github.com/articles/generating-ssh-keys/

They configured ssh key with passphrase for his github account.
They then confirmed that git clone from this github to local file system works without inputting passphrase.

e.g.

$ ssh -T git@github.com
$ git clone ssh://git@github.com/jboss/BPMSrepository.git

But when trying to clone it from this github on business central with above ssh url, it fails with the exception something like the following.

ERROR [org.guvnor.structure.backend.repositories.RepositoryServiceImpl] (http-localhost.localdomain/127.0.0.1:8080-5) Error during create repository: java.lang.RuntimeException: ssh://git@github.com:22: org.eclipse.jgit.transport.CredentialItem$StringTypeassphrase for /home/jboss/.ssh/id_rsa
:
Caused by: java.lang.RuntimeException: org.eclipse.jgit.errors.UnsupportedCredentialItem: ssh://git@github.com:22: org.eclipse.jgit.transport.CredentialItem$StringTypeassphrase for /home/jboss/.ssh/id_rsa

Version-Release number of selected component (if applicable):
BxMS 6.2.0

How reproducible:
see below

Steps to Reproduce:
1. According to the following document,

https://help.github.com/articles/generating-ssh-keys/

setup ssh key with passphrase and upload public key to your gut hub account

2. login business central and then create repository via
Authoring -> Administration -> Repositories -> clone repository
with the url something like

ssh://git@github.com/jboss/BPMSrepository.git

Actual results:
cloning repository fails as passphrase is required

Expected results:
closing repository succeed

Additional info: