disable appstream install as its not used (#674)

Author: swang392

tasks/pkg-redhat/install-installer-dnf.yml

@@ -4,6 +4,7 @@
     name: "{{ datadog_installer_flavor }}"
     update_cache: true
     state: latest # noqa package-latest
+    disablerepo: "appstream"
   register: datadog_installer_install_result
   # Since we want to send telemetry including when the installation failed,
   # we need to explicitely ignore failures and skip dependent task when one

tasks/pkg-redhat/install-latest.yml

@@ -13,6 +13,7 @@
     name: "{{ datadog_agent_target }}"
     update_cache: true
     state: latest # noqa package-latest
+    disablerepo: "appstream"
   register: agent_datadog_agent_install
   when: not ansible_check_mode
   notify: restart datadog-agent

tasks/pkg-redhat/install-pinned.yml

@@ -5,6 +5,7 @@
     update_cache: true
     state: present
     allow_downgrade: "{{ datadog_agent_allow_downgrade }}"
+    disablerepo: "appstream"
   register: agent_datadog_agent_install
   when: not ansible_check_mode
   notify: restart datadog-agent