Use python3 to install aws-cli V1 (actions#3740)

* Starting from version 1.20 aws-cli dropped python2 support

Author: miketimofeev

images/linux/scripts/installers/aws.sh

@@ -15,10 +15,11 @@ if isUbuntu20 ; then
     /tmp/aws/install -i /usr/local/aws-cli -b /usr/local/bin
 fi
 
+# The installation should be run after python3 is installed as aws-cli V1 dropped python2 support
 if isUbuntu16 || isUbuntu18 ; then
     download_with_retries "https://s3.amazonaws.com/aws-cli/awscli-bundle.zip" "/tmp" "awscli-bundle.zip"
     unzip -qq /tmp/awscli-bundle.zip -d /tmp
-    /tmp/awscli-bundle/install -i /usr/local/aws -b /usr/local/bin/aws
+    python3 /tmp/awscli-bundle/install -i /usr/local/aws -b /usr/local/bin/aws
 fi
 
 download_with_retries "https://s3.amazonaws.com/session-manager-downloads/plugin/latest/ubuntu_64bit/session-manager-plugin.deb" "/tmp" "session-manager-plugin.deb"

images/linux/ubuntu1804.json

@@ -199,7 +199,6 @@
                 "{{template_dir}}/scripts/installers/bicep.sh",
                 "{{template_dir}}/scripts/installers/aliyun-cli.sh",
                 "{{template_dir}}/scripts/installers/apache.sh",
-                "{{template_dir}}/scripts/installers/aws.sh",
                 "{{template_dir}}/scripts/installers/clang.sh",
                 "{{template_dir}}/scripts/installers/swift.sh",
                 "{{template_dir}}/scripts/installers/cmake.sh",
@@ -250,7 +249,8 @@
                 "{{template_dir}}/scripts/installers/android.sh",
                 "{{template_dir}}/scripts/installers/yq.sh",
                 "{{template_dir}}/scripts/installers/pypy.sh",
-                "{{template_dir}}/scripts/installers/python.sh"
+                "{{template_dir}}/scripts/installers/python.sh",
+                "{{template_dir}}/scripts/installers/aws.sh"
             ],
             "environment_vars": [
                 "HELPER_SCRIPTS={{user `helper_script_folder`}}",