e2e: ignore terminated processes on fetching allowed resources

Fetching allowed resources (needed by "verify" and "report allowed")
caused test failures when a process found by pgrep got terminated
before reading its /proc/pid/files. This change omits pids whose files
could not be read without errors.

demo/lib/topology.py

@@ -54,7 +54,7 @@
 
 _bash_topology_dump = """for cpu in /sys/devices/system/cpu/cpu[0-9]*; do cpu_id=${cpu#/sys/devices/system/cpu/cpu}; echo "cpu p:$(< ${cpu}/topology/physical_package_id) d:$(< ${cpu}/topology/die_id) n:$(basename  ${cpu}/node* | sed 's:node::g') c:$(< ${cpu}/topology/core_id) t:$(< ${cpu}/topology/thread_siblings) cpu:${cpu_id}" ; done;  for node in /sys/devices/system/node/node[0-9]*; do node_id=${node#/sys/devices/system/node/node}; echo "dist n:$node_id d:$(< $node/distance)"; echo "mem n:$node_id s:$(awk '/MemTotal/{print $4/1024}' < $node/meminfo)"; done"""
 
-_bash_res_allowed = r"""for process in '%s'; do for pid in $(pgrep -f "$process"); do name=$(cat /proc/$pid/cmdline | tr '\0 ' '\n' | grep -E "^$process" | head -n 1); [ -n "$name" ] && [ "$pid" != "$$" ] && [ "$pid" != "$PPID" ] && echo "${name}/${pid} $(awk '/Cpus_allowed:/{c=$2}/Mems_allowed:/{m=$2}END{print "c:"c" m:"m}' < /proc/$pid/status)"; done; done"""
+_bash_res_allowed = r"""for process in '%s'; do for pid in $(pgrep -f "$process"); do proc_pid_cmdline=$(< /proc/$pid/cmdline) || continue; proc_pid_status=$(< /proc/$pid/status) || continue; name=$(echo "$proc_pid_cmdline" | tr '\0 ' '\n' | grep -E "^$process" | head -n 1); [ -n "$name" ] && [ "$pid" != "$$" ] && [ "$pid" != "$PPID" ] && echo "${name}/${pid} $(awk '/Cpus_allowed:/{c=$2}/Mems_allowed:/{m=$2}END{print "c:"c" m:"m}' <<< "$proc_pid_status")"; done 2>/dev/null; done"""
 
 def error(msg, exit_status=1):
     """Print error message and exit."""