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