Description of problem:

The git ssh provider in uberfire supports username/password authentication, but not publickey authentication, which is the standard for ssh in most environments. Moreover, publickey authentication is very important when automating interacting with a git repository which is critical for many customers who require a git-svn bridge. In the short term, we need to update the documentation to reflect that we do not support this feature.

This is related to https://bugzilla.redhat.com/show_bug.cgi?id=1066962


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


How reproducible:
Always - verified by Alexandre Porcelli in IRC

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