[RFC PATCH 0/6] Travis: Change default environment to Ubuntu Bionic

[Wainer dos Santos Moschetta <wainersm@redhat.com>]

Most of the Travis jobs currently run on Ubuntu 16.04 (Xenial),
and some are already using 18.04 (Bionic). Other job will [1]
need the swap very soon. On Travis's Bionic environment it is
allowed the use of nested virtualization, so some tests relying
on kvm can be executed (currently they are skipped).

There is one problem [2] with libssh-dev on Ubuntu Bionic
though. Considering that, on this series I simply does not install it,
so QEMU is built without libssh support. I don't think this is
an impediment for this change anyway, if there is a need to test libssh
support we can add a single Xenial-based job for that.

This series was tested on [3]. The following jobs are intermittently
failing, I ran 3x each:

'GCC check-acceptance': 1 (Interrupted test)
'GCC plugins check-tcg (user)': 1 (job timeout)
'GCC check-tcg (some-softmmu)': 2 (docker OCI runtime start failed)
'GCC plugins check-tcg (some-softmmu)':  1 (OCI runtime start failed)

I've seen [4] those errors related with docker OCI on Xenial too.

Thanks!
- wainer

REFERENCES
[1] https://www.mail-archive.com/qemu-devel@nongnu.org/msg677078.html
[2] https://bugs.launchpad.net/qemu/+bug/1838763
[3] https://travis-ci.org/wainersm/qemu/builds/651549376
[4] https://travis-ci.org/qemu/qemu/builds/651506018

Wainer dos Santos Moschetta (6):
  travis.yml: Bump default environment to Ubuntu Bionic
  travis.yml: Fix 'GCC9 with sanitizers' job on Ubuntu Bionic
  travis.yml: Fix 'GCC check-acceptance' job on Ubuntu Bionic
  travis.yml: Fix 'Clang (main-softmmu)' job on Ubuntu Bionic
  travis.yml: Run '[ppc64] GCC check-tcg' job on Ubuntu Bionic
  travis.yml: Run '[aarch64] GCC check-tcg' job on Ubuntu Bionic

 .travis.yml | 79 ++++++++++-------------------------------------------
 1 file changed, 14 insertions(+), 65 deletions(-)

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