(PA-7433) Update task_spec to upgrade from puppet7 to latest puppet8 dev build

Previously, the puppet_agent::install task to install or upgrade to puppet8
used puppet8 builds from downloads.puppet.com. Since puppet8 builds are no
longer published there, this commit updates the puppet_agent::install task to
install or upgrade to puppet8 using the puppet8 dev builds from artifactory
instead.

This commit also adds some logger.info statements so it's easier to track
what specific version of puppet-agent is being upgraded to or installed.

Author: AriaXLi

task_spec/spec/acceptance/init_spec.rb

@@ -122,7 +122,6 @@ def latest_sources
                          end
 
       puppet_7_collection = 'puppet7'
-      puppet_8_collection = 'puppet8'
 
       # We can only test puppet 7 -> 7 upgrades if multiple Puppet releases
       # have supported a given platform.
@@ -161,6 +160,7 @@ def latest_sources
           expect(res['value']['version']).to eq(puppet_7_version)
         end
         expect(res['value']['source']).to be
+        logger.info("Successfully installed puppet-agent version: #{res['value']['version']}")
       end
 
       # Check that puppet agent service has been stopped due to 'stop_service' parameter set to true
@@ -174,7 +174,7 @@ def latest_sources
 
       # Try to upgrade with no specific version given in parameter
       # Expect nothing to happen and receive a message regarding this
-      results = run_task('puppet_agent::install', 'target', { 'collection' => puppet_8_collection })
+      results = run_task('puppet_agent::install', 'target', { 'collection' => 'puppet8-nightly'}.merge(latest_sources))
 
       results.each do |result|
         logger.info("Ensuring installed puppet-agent on #{result['target']}: #{result['status']}")
@@ -219,6 +219,7 @@ def latest_sources
           expect(res['value']['version']).not_to eq(puppet_7_version)
           expect(res['value']['version']).to match(%r{^7\.\d+\.\d+})
           expect(res['value']['source']).to be
+          logger.info("Successfully upgraded to puppet7 latest version: #{res['value']['version']}")
         end
       end
 
@@ -238,7 +239,8 @@ def latest_sources
       end
 
       # Succesfully upgrade from puppet7 to puppet8
-      results = run_task('puppet_agent::install', 'target', { 'collection' => puppet_8_collection, 'version' => 'latest' })
+      results = run_task('puppet_agent::install', 'target', { 'collection' => 'puppet8-nightly',
+                                                              'version' => 'latest'}.merge(latest_sources))
 
       results.each do |result|
         logger.info("Upgraded puppet-agent to puppet8 on #{result['target']}: #{result['status']}")
@@ -256,11 +258,13 @@ def latest_sources
         expect(installed_version).not_to match(%r{^7\.\d+\.\d+})
         expect(installed_version).to match(%r{^8\.\d+\.\d+})
         expect(res['value']['source']).to be
+        logger.info("Successfully upgraded to puppet8 latest version: #{res['value']['version']}")
       end
 
       # Try installing the same version again
       # Expect nothing to happen and receive a message regarding this
-      results = run_task('puppet_agent::install', 'target', { 'collection' => puppet_8_collection, 'version' => installed_version })
+      results = run_task('puppet_agent::install', 'target', { 'collection' => 'puppet8-nightly',
+                                                              'version' => installed_version}.merge(latest_sources))
 
       results.each do |res|
         expect(res).to include('status' => 'success')