Code review comment for ~smoser/curtin:bug/1767979-support-tmpfs-mounts

I successfully ran on diglett.

$ git rev-parse HEAD
3689a17896504548ce350b3914e433783a178c37
$ git branch | grep '^*'
* (HEAD detached at smoser/bug/1767979-support-tmpfs-mounts)

$ ( ./tools/jenkins-runner -p4 2>&1 ; echo $?; ) | tee out.log
CURTIN_VMTEST_IMAGE_SYNC=0
CURTIN_VMTEST_ISCSI_PORTAL=10.245.168.20:25468
CURTIN_VMTEST_KEEP_DATA_FAIL=logs,collect
CURTIN_VMTEST_KEEP_DATA_PASS=logs,collect
CURTIN_VMTEST_LOG=/srv/smoser/curtin/curtin/output/debug.log
CURTIN_VMTEST_PARALLEL=4
CURTIN_VMTEST_REUSE_TOPDIR=0
CURTIN_VMTEST_TAR_DISKS=0
CURTIN_VMTEST_TOPDIR=/srv/smoser/curtin/curtin/output
TGT_IPC_SOCKET=/srv/smoser/curtin/curtin/output/tgt.d/socket
TGT_LOG_D=/srv/smoser/curtin/curtin/output/tgt.d
TGT_PID=14464
TGT_PORTAL=10.245.168.20:25468
http_proxy=
https_proxy=
no_proxy=
Quering synced ephemeral images/kernels in /srv/images
======================================================================================
 Release Codename ImageDate Arch/SubArch Path
--------------------------------------------------------------------------------------
   12.04 precise 20170424 amd64/hwe-t precise/amd64/20170424/root-image.gz
   12.04 precise 20170424.1 amd64/hwe-p precise/amd64/20170424/squashfs
   14.04 trusty 20180502 amd64/hwe-t trusty/amd64/20180502/squashfs
   14.04 trusty 20180502 amd64/hwe-x trusty/amd64/20180502/squashfs
   14.04 trusty 20180502 i386/hwe-t trusty/i386/20180502/squashfs
   14.04 trusty 20180502 i386/hwe-x trusty/i386/20180502/squashfs
   16.04 xenial 20180511 amd64/ga-16.04 xenial/amd64/20180511/squashfs
   16.04 xenial 20180511 amd64/hwe-16.04 xenial/amd64/20180511/squashfs
   16.04 xenial 20180511 amd64/hwe-16.04-edge xenial/amd64/20180511/squashfs
   16.04 xenial 20180511 i386/ga-16.04 xenial/i386/20180511/squashfs
   16.04 xenial 20180511 i386/hwe-16.04 xenial/i386/20180511/squashfs
   16.04 xenial 20180511 i386/hwe-16.04-edge xenial/i386/20180511/squashfs
   17.04 zesty 20171219 amd64/ga-17.04 zesty/amd64/20171219/squashfs
   17.10 artful 20180516 amd64/ga-17.10 artful/amd64/20180516/squashfs
   18.04 bionic 20180509 amd64/ga-18.04 bionic/amd64/20180509/squashfs
   18.04 bionic 20180509 i386/ga-18.04 bionic/i386/20180509/squashfs
======================================================================================

Thu, 17 May 2018 12:33:54 +0000: vmtest start: nosetests3 --process-timeout=86400 --processes=4 -vv --nologcapture tests/vmtests/

...

Ran 3089 tests in 13381.016s

OK (SKIP=229)
Thu, 17 May 2018 17:44:56 +0000: vmtest end [0] in 13382s
0