DPL: allow --completion-policy <N>[s, m] to wait before quitting

[ktf]

In case of a completed processing, wait the specified number of seconds / minutes before quitting.

[alibuild]

Error while checking build/O2/fullCI_slc9 for 8295cec at 2026-06-10 06:50:

## sw/BUILD/O2-full-system-test-latest/log
command o2-sim --field=ccdb --vertexMode kCollContext --seed 12345 -n 5 --configKeyValues "Diamond.width[2]=6.;GenTPCLoopers.colsys=PbPb;" -g pythia8hi -e TGeant4 -j 24 --run 310000 -o o2sim --fromCollContext collisioncontext.root:o2sim had nonzero exit code 1
[ERROR] SHUTTING DOWN DUE TO SIGNALED EXIT IN COMPONENT 1420
[06:49:19][ERROR] CCDBDownloader CURL transfer error - Timeout was reached
[06:49:19][ERROR] CcdbDownloader finished transfer http://alice-ccdb.cern.ch/Users/m/mgiacalo/WGAN_ExtGenPair for 1781066956064 (agent_id: o2-sim-primary-/o2-sim-primary-server-device-runner@1383 target/Linux_x86_64 init/1781066808491 id/mesosci@alimetal02.cern.ch session/pFpdBxOj) with http code: 0
[06:49:19][ERROR] File Users/m/mgiacalo/WGAN_ExtGenPair could not be retrieved. No more hosts to try.
[06:49:19][ERROR] Unable to find object Users/m/mgiacalo/WGAN_ExtGenPair/1781066956064, Aborting
[06:49:19][FATAL] Error: issues in retrieving Users/m/mgiacalo/WGAN_ExtGenPair from CCDB!
[06:50:21][ERROR] No configuration received within 60000ms
[06:50:22][ERROR] Could not initialize simulation


## sw/BUILD/o2checkcode-latest/log
--
========== List of errors found ==========
++ GRERR=0
++ grep -v clang-diagnostic-error error-log.txt
++ grep ' error:'
grep: error-log.txt: binary file matches
++ GRERR=1
++ [[ 1 == 0 ]]
++ mkdir -p /sw/INSTALLROOT/ff63af14e4f7d3278b17553313d06ce138691471/slc9_x86-64/o2checkcode/1.0-local704/etc/modulefiles
++ alibuild-generate-module
+ HAS_BIN=
+ HAS_LIB=
+ HAS_CMAKE=
+ HAS_ROOT=
+ '[' 0 '!=' 0 ']'
+ cat
+ printf 'if ![ is-loaded '\''BASE/1.0'\'' ] {\n module load BASE/1.0\n}'
+ echo 'BUILD_REQUIRES=CMake alibuild-recipe-tools defaults-release'
BUILD_REQUIRES=CMake alibuild-recipe-tools defaults-release
+ FULL_BUILD_REQUIRES='safe_int ninja alibuild-recipe-tools Python-modules-list UUID ninja-fortran defaults-release date bz2 googlebenchmark MPFR FairCMakeModules O2-customization json-c CMake pytorch_cpuinfo Alice-GRID-Utils double-conversion'
+ echo 'FULL_BUILD_REQUIRES=safe_int ninja alibuild-recipe-tools Python-modules-list UUID ninja-fortran defaults-release date bz2 googlebenchmark MPFR FairCMakeModules O2-customization json-c CMake pytorch_cpuinfo Alice-GRID-Utils double-conversion'
FULL_BUILD_REQUIRES=safe_int ninja alibuild-recipe-tools Python-modules-list UUID ninja-fortran defaults-release date bz2 googlebenchmark MPFR FairCMakeModules O2-customization json-c CMake pytorch_cpuinfo Alice-GRID-Utils double-conversion
++ env
++ cut -f1 -d=
++ grep -v '^DEFAULT_'
++ grep -v PKGREVISION
++ grep -v ALIBUILD_RECIPE_TOOLS
++ grep REVISION
++ sed -e s/_REVISION//
+ for x in $(env | cut -f1 -d= | grep -v "^DEFAULT_" | grep -v PKGREVISION | grep -v ALIBUILD_RECIPE_TOOLS | grep REVISION | sed -e 's/_REVISION//')
++ eval 'echo $LIBFFI_REVISION'
+++ echo 10
+ REVISION_VALUE=10
++ eval 'echo $LIBFFI_VERSION'
+++ echo v3.2.1-alice1
+ VERSION_VALUE=v3.2.1-alice1
[0 more errors; see full log]

Full log here.