Build old releases of Osmocom programs and libraries against
"master of the day" to detect breakage.
Redirect each build's output to its own log file, so it is easy to see
what is currently getting build, and what failed. On error, print the
end of the new failing build logs, along with a note to find the full
logs in the jenkins artifacts.
This initial configuration builds the last three release tags of the
Osmocom repositories against master. The configuration can be changed
easily.
Indicate known failures with "err" instead of "ERR" in the output, do
not cause them to fail the build and do not print the beginning of the
error log (it is still in the artifacts). This way, new errors stand out
and don't get overlooked among the known errors.
Related: OS#3765
Change-Id: I7cb45cc40c9930840a3d4e6a86f39e1400478ed3
