Mongodb package name fix for ubuntu 18.04

- mongodb package name for 18.04 is 'mongodb-org'
- package name 'mongodb' will install mongodb
  from ubuntu repo which is 3.6 currently and is
  not a recommended way.

Author: psabhay

tasks/install.debian.yml

@@ -34,8 +34,8 @@
 
 - name: Fail when used wrong mongodb_version variable with Ubuntu 18.04
   fail:
-    msg: "mongodb_version variable should be '3.6' or '4.0' and mongodb_package should be 'mongodb' for Ubuntu 18.04"
-  when: ((mongodb_package == 'mongodb-org' or (mongodb_version != '3.6' and mongodb_version != '4.0'))
+    msg: "mongodb_version variable should be '3.6' or '4.0' and mongodb_package should be 'mongodb-org' for Ubuntu 18.04"
+  when: ((mongodb_package != 'mongodb-org' or (mongodb_version != '3.6' and mongodb_version != '4.0'))
         and ansible_distribution_release == "bionic")
 
 - name: Fail when used wrong mongodb_version variable