summarize-jenkins-build: allow reading from file or standard input
summarize-jenkins-build: allow reading from file or standard input

If the caller has already fetched build data from Jenkins, we can avoid
another round trip by reading the data from a file or STDIN.

Change-Id: I5dad84b405018e58fe4f34d1e063f3916dadc7dc
Reviewed-by: Sergio Ahumada <27ca633ce817d1c3858ceeac3c99febb78411853@nokia.com>

tsarajar/qtqa,tsarajar/qtqa,tsarajar/qtqa,tsarajar/qtqa