xenial capitalizes unknown interface from ifup

- we want to ignore this just like we do on silly
trusty

[152702490](https://www.pivotaltracker.com/story/show/152702490)

Signed-off-by: Kai Hofstetter <[email protected]>

log a warning instead of returning error

ifup on xenial will return a non-zero exit code and
if this is your initial pass at configuring
a network you will end up with no network
interfaces to configure.

[#152702490](https://www.pivotaltracker.com/story/show/152702490)

Signed-off-by: Kai Hofstetter <[email protected]>

ipv6 for manual networking on ubuntu

Signed-off-by: dmitriy kalinin <[email protected]>

remove focus on closewinrm port test

Signed-off-by: Lisa Oakley <[email protected]>

Don't remove DNS hosts on Windows if CC host list is empty

[#152405334](https://www.pivotaltracker.com/story/show/152405334)

Removing unused import in settings (relating to env.blobstore changes)

Signed-off-by: Gaurab Dey <[email protected]>

Revert "Close WinRM port 5985"

This reverts commit 7cd9007.

This causes the agent to crash on startup when no rules exist for this
firewall port.

[#151329914](https://www.pivotaltracker.com/story/show/151329914)

Merge branch 'ipv6_oct_12' into develop

Fix integration tests assertion to have correct perms

[#152290440](https://www.pivotaltracker.com/story/show/152290440)

Signed-off-by: J Evelyn Quintana <[email protected]>

Fix integration tests assertion to have correct perms

[#152290440](https://www.pivotaltracker.com/story/show/152290440)

Signed-off-by: Tom Viehman <[email protected]>