fix: use stricter not found matching for lvm calls #892
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fix #889 by changing the simple exitcode==5 check to a check that also verifies the returned stderr for the regex
Volume group "(.*?)" not found|Failed to find logical volume "(.*?)
so that errors that have exit code 5 but are not about the volume not being present do not cause TopoLVM to ignore the volume.Since the lvm error handling got a bit too big for my taste I moved it into a separate file. I also added a test case to cover this regex style parsing.