umount01: Simplify test using TST_ macros #1524

Job	Run time
job (debian:stable, gcc, i386)	9m 11s
job (debian:stable, ppc64el, powerpc64le-linux-gnu-gcc, 1, out, cross-compile)	7m 40s
job (debian:stable, arm64, aarch64-linux-gnu-gcc, 1, out, cross-compile)	7m 57s
job (debian:stable, s390x, s390x-linux-gnu-gcc, 1, out, cross-compile)	6m 31s
job (alpine:latest, gcc, asciidoctor)	7m 9s
job (debian:stable, gcc, out, minimal)	7m 32s
job (fedora:latest, clang, 1, asciidoctor-pdf)	10m 26s
job (centos:7, gcc, asciidoc-pdf, out)	6m 9s
job (debian:testing, gcc, asciidoctor-pdf)	10m 37s
job (debian:oldstable, clang)	9m 15s
job (opensuse/leap:latest, gcc, asciidoc-pdf)	9m 35s
job (debian:oldstable, gcc, asciidoctor)	7m 32s
job (debian:testing, clang, asciidoctor-pdf)	10m 39s
job (ubuntu:jammy, gcc, asciidoctor, out)	5m 26s
job (ubuntu:bionic, gcc, asciidoc-pdf)	7m 4s
	2h 2m 43s

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