integration/windows: uploaded blobs should be tgzs

The previous agent implementation didn't care whether or not job or
package blobs were compressed or not. However, it is expected that the
director will only ever upload compressed packages and so this test was
not representitive of reality.

I expect there will be other failures here but it doesn't seem to be
possible to easily `fly execute` the Windows integration tests.

[#161569370](https://www.pivotaltracker.com/story/show/161569370)

Retry extration with leading ./ on failure

Rendered job template archives take different forms depending on whether
or not they were delivered over NATS or via the blobstore. A leading ./
may be present. The old method of extracting everthing to an interim
temporary directory did not care about these specific pathing issues but
the new selective extraction does.

As a crude fix to get the pipeline green we retry with a leading ./ if
the extraction fails. We will add a proper fix which checks to see which
prefix to use without retrying unnecessarily tomorrow.

[#161569370](https://www.pivotaltracker.com/story/show/161569370)

Co-authored-by: Josh Russett <[email protected]>

Bump bosh-utils (reverts ReadLink change)

A PR to bosh-utils broke some of the unit tests on Windows. Feedback
about the issue was sent to the PR submitters
(https://main.bosh-ci.cf-app.com/teams/main/pipelines/bosh-agent/jobs/windows-test-unit/builds/440)
to remedy it.  For now, the change has been reverted on master of
bosh-utils.

Co-authored-by: Christopher Brown <[email protected]>

allow explicitly choosing sfdisk for persistent disk

We previously added the ability to chose sfdisk explicitly for ephemeral
and root disk but missed persistent disks.

This adds the ability for one to use the persistent_disk_partitioner env
configuration with sfdisk.

This is a backport of commit from develop: e9ad956

[#161925673](https://www.pivotaltracker.com/story/show/161925673)

Co-authored-by: Belinda Liu <[email protected]>

mount sensitive blobs on tmpfs if requested

We use the same feature flag as the jobs directory because the user
intent is the same and you would never want one without the other. The
size parameter is also the same because they will store the same pieces
of data.

[#161569370](https://www.pivotaltracker.com/story/show/161569370)

Co-authored-by: Luan Santos <[email protected]>

remove go 1.8 ci jobs

Go 1.8 was only kept around for Trusty stemcells and we are no longer
making those.

Co-authored-by: Christopher Brown <[email protected]>

Make chrony log to ephemeral disk

- Give world execute permission (771) to /var/log
- Optionally create /var/log/chrony folder with right permissions
- Move SetTimeWithNtpServers after setting up log folder
- Explicitly test order of shell commands in existing tests

[#161466542](https://www.pivotaltracker.com/story/show/161466542)

Co-authored-by: Max Petersen <[email protected]>

Make chrony log to ephemeral disk

- Give world execute permission (771) to /var/log
- Optionally create /var/log/chrony folder with right permissions
- Move SetTimeWithNtpServers after setting up log folder
- Explicitly test order of shell commands in existing tests

[#161466542](https://www.pivotaltracker.com/story/show/161466542)

Signed-off-by: Max Petersen <[email protected]>

use bosh user in unit tests

We have tests which rely on permissions checks which are ignored when
root.

Co-authored-by: Christopher Brown <[email protected]>

Allow explict setting of partitioner to sfdisk

[finishes #161925673](https://www.pivotaltracker.com/story/show/161925673)