Prevent shell redirection when installing packages

[jefferbrecht]

Description

When specifying a version constraint with zypper, the lack of quotes can cause shell redirection instead.

Related issue

b/307553822

How has this been tested?

Will let presubmits run.

Checklist:

• Unit tests
  • Unit tests do not apply.
  • Unit tests have been added/modified and passed for this PR.
• Integration tests
  • Integration tests do not apply.
  • Integration tests have been added/modified and passed for this PR.
• Documentation
  • This PR introduces no user visible changes.
  • This PR introduces user visible changes and the corresponding documentation change has been made.
• Minor version bump
  • This PR introduces no new features.
  • This PR introduces new features, and there is a separate PR to bump the minor version since the last release already.
  • This PR bumps the version.

[martijnvans]

go/shell-style#quoting says to use single quotes unless you want (or can tolerate, lol) substitutions. Up to you whether you care enough to change that.

[jefferbrecht]

go/shell-style#quoting says to use single quotes unless you want (or can tolerate, lol) substitutions. Up to you whether you care enough to change that.

Good point, changed to single quotes.

[jefferbrecht]

Doesn't appear to fix the SLES 12 build after all but I'll merge this anyway just in case. We can do a separate PR to fix the issue with the bison repo not getting added correctly.