[RFC PATCH 2/6] travis.yml: Fix 'GCC9 with sanitizers' job on Ubuntu Bionic

[Wainer dos Santos Moschetta]

This changes the 'GCC9 with sanitizers' job to run correctly
on Ubuntu Bionic. It was needed to solved the problems:

1) The new environment changed how APT sources are handled,
resulting on the error:

```
Disallowing sources: ubuntu-toolchain-r-test

To add unlisted APT sources, follow instructions in 
https://docs.travis-ci.com/user/installing-dependencies#Installing-Packages-with-the-APT-Addon
```

Thus, the reference to 'ubuntu-toolchain-r-test' is passed via
'sourceline' now.

2) Adjusted the name of some packages

3) Libssh-dev is not installed due known issue on Bionic

Signed-off-by: Wainer dos Santos Moschetta <address@hidden>
---
 .travis.yml | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/.travis.yml b/.travis.yml
index e46c44bbee..232f84d196 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -336,7 +336,7 @@ matrix:
           update: true
           sources:
             # PPAs for newer toolchains
-            - ubuntu-toolchain-r-test
+            - sourceline: 'ppa:ubuntu-toolchain-r/test'
           packages:
             # Extra toolchains
             - gcc-9
@@ -346,7 +346,7 @@ matrix:
             - libattr1-dev
             - libbrlapi-dev
             - libcap-ng-dev
-            - libgnutls-dev
+            - libgnutls28-dev
             - libgtk-3-dev
             - libiscsi-dev
             - liblttng-ust-dev
@@ -354,14 +354,15 @@ matrix:
             - libncurses5-dev
             - libnss3-dev
             - libpixman-1-dev
-            - libpng12-dev
+            - libpng-dev
             - librados-dev
             - libsdl2-dev
             - libsdl2-image-dev
             - libseccomp-dev
             - libspice-protocol-dev
             - libspice-server-dev
-            - libssh-dev
+# https://bugs.launchpad.net/qemu/+bug/1838763
+#            - libssh-dev
             - liburcu-dev
             - libusb-1.0-0-dev
             - libvte-2.91-dev
-- 
2.24.1