read_all: limit sysfs tpm entries to single worker #245

Job	Run time
job (debian:stable, gcc, i386)	6m 50s
job (debian:stable, ppc64el, powerpc64le-linux-gnu-gcc, 1, out, cross-compile)	5m 26s
job (debian:stable, arm64, aarch64-linux-gnu-gcc, 1, out, cross-compile)	5m 11s
job (debian:stable, s390x, s390x-linux-gnu-gcc, 1, out, cross-compile)	4m 58s
job (alpine:latest, gcc, asciidoctor)	4m 42s
job (debian:stable, gcc, out, minimal)	3m 27s
job (opensuse/archive:42.2, gcc)	1h 3m 55s
job (quay.io/centos/centos:stream9, gcc, asciidoc-pdf, out)	4m 21s
job (debian:testing, gcc, asciidoctor-pdf)	6m 58s
job (debian:oldstable, clang)	7m 24s
job (fedora:latest, clang, 1, asciidoctor-pdf)	6m 44s
job (opensuse/leap:latest, gcc, asciidoc-pdf)	5m 41s
job (debian:oldstable, gcc, asciidoctor)	5m 53s
job (debian:testing, clang, asciidoctor-pdf)	8m 48s
job (ubuntu:jammy, gcc, asciidoctor, out)	4m 10s
job (ubuntu:bionic, gcc, asciidoc-pdf)	5m 24s
	2h 29m 52s

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