tests: fix package and ca_cert cloud_tests on bionic

package_update_upgrade_install was failing as htop is now included in
Bionic images.  Switch this test to install 'sl' instead.

ca_certs integration test fails on cert_count test because bionic
update-ca-certificates on bionic generates less symlinks for a given cert.

Integration tests now collect dpkg-query --show output on every instance.
Add a new assertPackageInstalled helper method which finds the package or
package version installed on the instance.

Adapt existing byobu, package_update_upgrade_install, ntp and salt_minion
tests to use assertPackageInstalled method.

LP: #1769985

1 files changed, 6 insertions, 2 deletions

diff --git a/tests/cloud_tests/testcases/modules/ca_certs.yaml b/tests/cloud_tests/testcases/modules/ca_certs.yaml
index d939f435..2cd91551 100644
--- a/tests/cloud_tests/testcases/modules/ca_certs.yaml
+++ b/tests/cloud_tests/testcases/modules/ca_certs.yaml
@@ -43,9 +43,13 @@ cloud_config: |
         DiH5uEqBXExjrj0FslxcVKdVj5glVcSmkLwZKbEU1OKwleT/iXFhvooWhQ==
         -----END CERTIFICATE-----
 collect_scripts:
-  cert_count: |
+  cert_links: |
     #!/bin/bash
-    ls -l /etc/ssl/certs | wc -l
+    # links printed <filename> -> <link target>
+    # non-links printed <filename>
+    for file in `ls /etc/ssl/certs`; do
+        [ -h /etc/ssl/certs/$file ] && echo -n $file ' -> ' && readlink /etc/ssl/certs/$file || echo $file;
+    done
   cert: |
     #!/bin/bash
     md5sum /etc/ssl/certs/ca-certificates.crt