tools: Setting ClientConsoleModeDefault

This patch adds the possibility of setting the default console invocation
behavior in the engine.

Change-Id: Ibeb1e7280f02cf63453d2f46330c14ef426f98f9
Bug-Url: https://bugzilla.redhat.com/843410
Signed-off-by: Frantisek Kobzik <fkobzik@redhat.com>