removing var definitions from group_vars/all that were moved to common

playbooks/group_vars/all

 ---
-# This should only have variables
-# that are applicable to all edX roles
-
-data_dir: /edx/var
-app_dir: /edx/app
-log_dir: "{{ data_dir }}/log"
-bin_dir: /edx/bin
-cfg_dir: /edx/etc
-
-os_name: ubuntu
-
-COMMON_ENV_NAME: 'default_env'
-COMMON_ENV_TYPE: 'default_type'
-
 # these pathes are relative to the playbook dir
 # directory for secret settings (keys, etc)
-secure_dir: 'secure_example'
+secure_dir: 'path/to/secure_example'
 
 # this indicates the path to site-specific (with precedence)
 # things like nginx template files
-local_dir:  '../../ansible_local'
-# include http/https
-COMMON_PYPI_MIRROR_URL: 'https://pypi.python.org/simple'
-# do not include http/https
-COMMON_GIT_MIRROR: 'github.com'
+local_dir:  'path/to/ansible_local'