fixed apt install packages for bionic

Change-Id: I216e70af5f160cc55d77acfd4143fb91c3f434c6
diff --git a/playbooks/roles/tcwg-apt-install/tasks/main.yml b/playbooks/roles/tcwg-apt-install/tasks/main.yml
index 381ed19..59b878a 100644
--- a/playbooks/roles/tcwg-apt-install/tasks/main.yml
+++ b/playbooks/roles/tcwg-apt-install/tasks/main.yml
@@ -71,7 +71,7 @@
      - lsb-build-base
      - lsb-build-cc
      - lsb-build-c++
-   when: ansible_distribution_release != "xenial"
+   when: ansible_distribution_release == "trusty"
 
  - name: Install perf packages
    apt: pkg={{ item }} state=present