Changes

jenkins.sh: pin libosmocore version to current version v1.14

osmo-ccid-firmware isn't using much of libosmocore.
Use a specific version instead of the current master.
This also improve reproducible builds, because the jenkins would otherwise
use the current master commit to build it.

Related: OS#6987
Change-Id: I678957099348e067d62a4abd04cbdac822463cf4

tests/sysmo-octsim/run-tests: tempfile -> mktemp

Fix for:
  WARNING: tempfile is deprecated; consider using mktemp instead.

Change-Id: I785a81173aae7202e4c01ead0ced11142d2e1794

timers: fix ATR timeout

Default WWT to 1.5s.

Both atr and card uart timeouts were combined in
7ae9a65c7fadf3d9d89370761c7352cbcac83a00 but the timeout
was accidentally left as 0 which was the original ATR fsm
state change timeout. The current code uses 0 as
"no timeout", so that killed the timeouts during the ATR.

Related: SYS#7991
Change-Id: I94d6641a10bf6d1df8640727e753da8171267339

tests/fetch_image: add SKIP_FETCH_IMAGE env var

Allow skipping the image fetch logic to let the gerrit job copy the
image from another job instead.

Related: osmo-ci I736b2b194813e6edff0197145fe08168c3e66903
Change-Id: I9445d6d5e4723bf6a87d4bffcdc638560471328b

contrib/jenkins: add SKIP_FIRMWARE_CLEAN argument

If this is set, then don't clean the firmware at the end. This is needed
to store the built firmware as artifact in jenkins, for passing it along
to another job.

Related: SYS#7963
Change-Id: I9e2342b8111645ef5d3b7bf4ac364ca592aa600b