Fix failure introduced in #176.

Author: Kami

packs/tests/actions/chains/test_run_pack_tests_tool.yaml

@@ -3,7 +3,8 @@ vars:
     base_repo_url: "https://github.com/StackStorm"
     # Note: Pack 1 should have no external dependencies beyond Python stdlib ones.
     pack_to_install_1: "csv"
-    pack_to_install_2: "xml=0.3.0"
+    pack_to_install_2: "xml"
+    pack_to_install_2_with_version: "xml=0.3.0"
     test_timeout: 180
 
 chain:
@@ -38,7 +39,7 @@ chain:
               ST2_AUTH_URL: "{{protocol}}://{{hostname}}:9100"
               ST2_API_URL: "{{protocol}}://{{hostname}}:9101"
               ST2_AUTH_TOKEN: "{{token}}"
-            cmd: "st2 pack install {{ pack_to_install_2 }}"
+            cmd: "st2 pack install {{ pack_to_install_2_with_version }}"
             timeout: "{{test_timeout}}"
         on-success: test_installed_pack_2_version
         on-failure: error_handler
@@ -47,7 +48,7 @@ chain:
         name: test_installed_pack_2_version
         ref: tests.test_installed_pack_version
         params:
-            installed_pack: "{{ pack_to_install_2 }}"
+            installed_pack: "{{ pack_to_install_2_with_version }}"
         on-success: run_pack_tests_without_creating_virtualenv
         on-failure: error_handler