disabling opensuse until timeout issue is fixed

[sergiocazzolato]

The prepare is getting stuck with this error.

173 new packages to install.
Overall download size: 90.9 MiB. Already cached: 0 B. After the operation, additional 526.3 MiB will be used.
Continue? [y/n/? shows all options] (y): y

This is an example:
https://travis-ci.org/snapcore/snapd/builds/303450521?utm_source=github_status&utm_medium=notification

[codecov-io]

Codecov Report

Merging #4244 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #4244   +/-   ##
=======================================
  Coverage   75.95%   75.95%           
=======================================
  Files         440      440           
  Lines       38427    38427           
=======================================
  Hits        29189    29189           
  Misses       7224     7224           
  Partials     2014     2014

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