Added more options to the Build Timeout plugin

Added the options:
 - type: absolute, elastic ot likely-stuck
 - write-description: Write a message on the description
 - elastic-percentage: percentage for the elastic type
 - elastic-default-timeout: default minutes for elastic type

Change-Id: Ib9cfce97b3373d375b8631d3b6f3c7a61c69b446
Signed-off-by: David Caro <dcaroest@redhat.com>
Merge "Added more options to the Build Timeout plugin"