Fix --local-mirror mounting #7559

Job	Run time
unit-test	1m 4s
integration-test (arch, arch)	14m 44s
integration-test (arch, debian)	14m 44s
integration-test (arch, fedora)	14m 45s
integration-test (arch, ubuntu)	14m 43s
integration-test (centos, debian)	14m 43s
integration-test (centos, fedora)	14m 43s
integration-test (centos, opensuse)	14m 44s
integration-test (centos, ubuntu)	14m 45s
integration-test (debian, arch)	14m 43s
integration-test (debian, debian)	14m 41s
integration-test (debian, fedora)	14m 44s
integration-test (fedora, arch)	14m 43s
integration-test (fedora, debian)	14m 42s
integration-test (debian, ubuntu)	14m 48s
integration-test (fedora, fedora)	14m 42s
integration-test (fedora, opensuse)	14m 41s
integration-test (fedora, ubuntu)	14m 43s
integration-test (opensuse, arch)	14m 40s
integration-test (opensuse, debian)	14m 41s
integration-test (opensuse, fedora)	14m 40s
integration-test (opensuse, opensuse)	14m 43s
integration-test (opensuse, ubuntu)	14m 41s
integration-test (ubuntu, arch)	14m 47s
integration-test (ubuntu, debian)	14m 43s
integration-test (ubuntu, fedora)	14m 42s
integration-test (ubuntu, ubuntu)	14m 44s
	6h 23m 43s

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