SRU Verification, Eoan/19.10

LXD deb in Eoan uses the snap, which includes it's own version of LXCFS.
Testing altered to verify that LXCFS in Eoan/universe is fixed.

root@test-lxcfs-eoan:~# dpkg -l lxcfs
Desired=Unknown/Install/Remove/Purge/Hold
| Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend
|/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad)
||/ Name           Version        Architecture Description
+++-==============-==============-============-=================================
ii  lxcfs          3.0.4-2ubuntu1 amd64        FUSE based filesystem for LXC

Create LXCFS filesystem for testing:


root@test-lxcfs-eoan:~# lxcfs -f -p /run/tmp_lxcfs ./test/
mount namespace: 5
hierarchies:
  0: fd:   6: memory
  1: fd:   7: blkio
  2: fd:   8: rdma
  3: fd:   9: hugetlb
  4: fd:  10: pids
  5: fd:  11: devices
  6: fd:  12: net_cls,net_prio
  7: fd:  13: freezer
  8: fd:  14: perf_event
  9: fd:  15: cpu,cpuacct
 10: fd:  16: cpuset
 11: fd:  17: name=systemd
 12: fd:  18: unified

Test session 1:
watch -n0.1 "grep SwapFree ./test/proc/meminfo"

Test session 2:
root@test-lxcfs-eoan:~# while true; do grep SwapFree ./test/proc/meminfo ; done
...
SwapFree:        2097148 kB
SwapFree:        2097148 kB
SwapFree:        2097148 kB
SwapFree:        2097148 kB
SwapFree:        2097148 kB
SwapFree:        2097148 kB
SwapFree:        2097148 kB
SwapFree:        2097148 kB
SwapFree:        2097148 kB
SwapFree:        2097148 kB
SwapFree:        2097148 kB
SwapFree:        2097148 kB
....

Problem doesn't reproduce with the package in -proposed

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https://bugs.launchpad.net/bugs/1860813

Title:
  LXC container reports spike in swap occasionally

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