The test depends on /sys being writable, so let's skip it when /sys is read-only. (cherry picked from commit 34b5977015a557840988e825ac116a7f09d0be75) (cherry picked from commit 4dc37994e283d2e8af612519fd3fac195fc47e56) (cherry picked from commit 0acf4d71e02d99b64c1644c2df3775c07a82aba1)
System and Service Manager
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