Fix detection of lvm setups. (#1026466)
Fix detection of lvm setups. (#1026466)

Fixes two regressions introduced by
commit 8ef070b7b6fe4f270cc0120e5425299abf90b8cd

Because of how space is calculated, setting copies to 0 means the LV
occupies no space in the VG, which is obviously not so.

Also, the spare metadata LV's size is handled as part of the 20% pad
in the VG for pool metadata. Counting it in both places causes more
problems since we didn't take it into account when creating the pool.

jkonecny12/blivet,vojtechtrefny/blivet,jkonecny12/blivet,rvykydal/blivet,AdamWill/blivet,vojtechtrefny/blivet,dwlehman/blivet,AdamWill/blivet,rhinstaller/blivet,dwlehman/blivet,rhinstaller/blivet,vpodzime/blivet,rvykydal/blivet,vpodzime/blivet