[Ubuntu] add aria2 to toolset (#3916)

aria2 is already installed as part of 133db65488/images/linux/scripts/base/apt.sh (L29)
This change will add aria2 to the list of apt packages in generated README

images/linux/scripts/base/apt.sh

@@ -25,8 +25,8 @@ echo 'APT sources limited to the actual architectures'
 cat /etc/apt/sources.list
 
 apt-get update
-# Install aria2 , jq
-apt-get install aria2 jq
+# Install jq
+apt-get install jq
 
 # Install apt-fast using quick-install.sh
 # https://github.com/ilikenwf/apt-fast

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

@@ -14,6 +14,11 @@ Describe "Apt" {
             $toolName = "getfacl"
         }
 
+        if ($toolName -eq "aria2")
+        {
+            $toolName = "aria2c"
+        }
+
         if ($toolName -eq "p7zip-full")
         {
             $toolName = "p7zip"