[Merge] lp:~legovini/ubuntu-test-cases/s390x into lp:ubuntu-test-cases/server

[Paride Legovini]

Paride Legovini has proposed merging lp:~legovini/ubuntu-test-cases/s390x into lp:ubuntu-test-cases/server.

Commit message:
Preseed fixes:
 - all: set the http/proxy to the empty string instead of "None"
 - default: configure the ssh network-console (needed for s390x)

Requested reviews:
  Ubuntu Server QA (ubuntu-server-qa)

For more details, see:
https://code.launchpad.net/~legovini/ubuntu-test-cases/s390x/+merge/364963
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