Revert "Explicitly trap on ERR" and fix exit code hanlding

Trapping on ERR does not do what is implied here and is redundant when
trapping on EXIT is used together with `set -e`. The real problem is
that in the CI scripts we pipe test-bifrost.sh into tee with a log file
without setting -o pipefail in bash. This change fixes it.

This reverts commit b31bc66726ddcff11678a77cce8b14f629a1b19d.

Change-Id: Ifca4049f5967c0b2153ecffb4c153a96b4a62cc7

playbooks/ci/run.yaml

@@ -1,8 +1,11 @@
 - hosts: all
   tasks:
     - shell:
-        cmd: bash scripts/test-bifrost.sh 2>&1 | tee "{{ ansible_user_dir }}/bifrost.log"
+        cmd: |
+          set -eo pipefail
+          ./scripts/test-bifrost.sh 2>&1 | tee "{{ ansible_user_dir }}/bifrost.log"
         chdir: "{{ ansible_user_dir }}/{{ zuul.projects['opendev.org/openstack/bifrost'].src_dir }}"
+        executable: /bin/bash
       environment:
         BIFROST_TRACE: "true"
         BUILD_IMAGE: "{{ build_image | default(false) | bool | lower }}"

scripts/collect-test-info.sh

@@ -83,7 +83,8 @@ sudo journalctl -u uwsgi@keystone-admin &> ${LOG_LOCATION}/keystone-admin.log
 
 # Copy PXE information
 mkdir -p ${LOG_LOCATION}/pxe/
-cp /httpboot/ipxe.* ${LOG_LOCATION}/pxe/
+ls -lR /httpboot > ${LOG_LOCATION}/pxe/listing.txt
+cp -aL /httpboot/*.ipxe ${LOG_LOCATION}/pxe/
 cp -aL /httpboot/pxelinux.cfg/ ${LOG_LOCATION}/pxe/
 
 # Copy baremetal information

scripts/test-bifrost.sh

@@ -139,7 +139,6 @@ on_exit() {
     $SCRIPT_HOME/collect-test-info.sh
 }
 trap on_exit EXIT
-trap on_exit ERR
 
 # Change working directory
 cd $BIFROST_HOME/playbooks