[Ubuntu] Do not import Az.Account module on Ubuntu 18.04 (#2729)

* do not install dbus-user-session on Ubuntu 18.04

* update test for Ubuntu 18.04

* revert changes

* do not import Az.Accounts module

* remove space

* update PowerShell test

images/linux/scripts/installers/containers.sh

@@ -4,8 +4,6 @@
 ##  Desc:  Installs container tools: podman, buildah and skopeo onto the image
 ################################################################################
 
-source $HELPER_SCRIPTS/os.sh
-
 # Install podman, buildah, scopeo container's tools
 install_packages=(podman buildah skopeo)
 source /etc/os-release
@@ -17,6 +15,4 @@ apt-get -qq -y install ${install_packages[@]}
 mkdir -p /etc/containers
 echo -e "[registries.search]\nregistries = ['docker.io', 'quay.io']" | tee /etc/containers/registries.conf
 
-if isUbuntu18 || isUbuntu20 ; then
 invoke_tests "Tools" "Containers"
-fi

images/linux/scripts/tests/PowerShellModules.Tests.ps1

@@ -30,7 +30,6 @@ Describe "AzureModules" {
         $moduleName = $module.name
 
         Context "$moduleName" {
-
             foreach ($version in $module.versions) {
                 $modulePath = Join-Path -Path $modulesRootPath -ChildPath "${moduleName}_${version}"
                 $moduleInfo = @{ moduleName = $moduleName; modulePath = $modulePath; expectedVersion = $version }
@@ -42,9 +41,7 @@ Describe "AzureModules" {
                         )
 
                         $env:PSModulePath = "${modulePath}:${env:PSModulePath}"
-                        Import-Module -Name $moduleName
-                        (Get-Module -Name $moduleName).Version.ToString()
-
+                        (Get-Module -ListAvailable -Name $moduleName).Version.ToString()
                     } -ArgumentList $modulePath, $moduleName
 
                     $moduleVersion = $testJob | Wait-Job | Receive-Job