[Bug 1320327] [NEW] configure getty properly on serial consoles using hardware flow control

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[Impact]
Hardware that uses hardware flow control for the serial console will not run a getty in the correct mode, possibly causing loss of functionality. Canonical would like to enable some such hardware in an upcoming point release.

[Test Case]
Use d-i to install a system booted with hardware flow control enabled (e.g. console=ttyS0,115200n8r). On system boot, verify that the getty was started without the "-h" parameter.

But, I did test this by using a trusty installer w/ the upstream change on an HP Moonshot system, booted with both "console=ttyS0,115200" and "console=ttyS0,115200n8r", and observed no issues. I also confirmed the getty was
getting configured with the correct parameters in each case.

[Regression Potential]
Assuming the upstream fix is correct, the regression potential would be limited to hardware that reports itself as using hardware flow control, but does not actually work with hardware flow control. Discussion on the upstream list suggested this wasn't an issue: https://lists.debian.org/debian-boot/2014/05/msg00130.html

If the getty hardware flow control is broken, it might leave a system
more unusable than it would be if incorrectly configured. The testing I
performed (described above) found no such issues.

Of course, if the upstream fix is buggy, it could end up breaking the
serial console configuration.

** Affects: finish-install (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: hs-arm64 patch
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configure getty properly on serial consoles using hardware flow control
https://bugs.launchpad.net/bugs/1320327
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