username provide to the git commiter should be first name + lastname

[sunix]

Describe the bug

#14416 provides a nice feature: the Che user don't have to fill his name and email to perform a git commit: all is already injected with the default information that the user have generally provided when creating its user profile.
The problem is, name use is the username, not the first name + the last name. Which is not very nice when username is not meaning full. For instance, in some environment, my username is user1.

when executing git log:

commit 8e804b49c7313a036d4c973f4718b618dad6b5d8
Author: user1 <sutan@redhat.com>
Date:   Thu Dec 5 15:24:50 2019 +0000

    removing unused yarn.lock that also contain security warning

commit 4ed171b13f05df5417ec9995ff0295ff1145633f
Author: user1 <sutan@redhat.com>
Date:   Thu Dec 5 15:08:43 2019 +0000

    adding missing env file (was in .gitignore ...)

commit afba9a437aac4cc83fc72508abd70ef9a9c44bd0
Author: user1 <sutan@redhat.com>
Date:   Thu Dec 5 14:57:05 2019 +0000

    Reenable react devmode by using proxy feature

[sunix]

should probably be fixed in https://github.com/eclipse/che/blob/master/infrastructures/kubernetes/src/main/java/org/eclipse/che/workspace/infrastructure/kubernetes/provision/GitConfigProvisioner.java

[che-bot]

Issues go stale after 180 days of inactivity. lifecycle/stale issues rot after an additional 7 days of inactivity and eventually close.

Mark the issue as fresh with /remove-lifecycle stale in a new comment.

If this issue is safe to close now please do so.

Moderators: Add lifecycle/frozen label to avoid stale mode.