Converted the limits config to use systemd

The old limits config was still running on the upstart setup. While the
directories within the ubuntu exist they are ignored in Ubuntu 16.04 and
CentOS 7. This change removes the old upstart config and adds the
required systemd config.

Change-Id: Ic75d6cfe32678f4205d6f8ea991f393526d0a082
Signed-off-by: Kevin Carter <kevin.carter@rackspace.com>

tasks/swift_init_systemd.yml

@@ -43,7 +43,6 @@
   with_dict: "{{ swift_services }}"
   when: inventory_hostname in groups[item.value.group]
 
-
 - name: Create tmpfiles.d entry
   template:
     src: "swift-systemd-tmpfiles.j2"
@@ -65,3 +64,4 @@
   when: inventory_hostname in groups[item.value.group]
   notify:
     - Reload systemd daemon
+

tasks/swift_pre_install.yml

@@ -90,19 +90,3 @@
     mode: "0755"
     owner: "root"
     group: "root"
-
-- name: Configure soft file limits
-  lineinfile:
-    dest: "/etc/security/limits.conf"
-    regexp: "^{{ swift_system_user_name }}.*soft.*nofile.*"
-    state: "present"
-    line: "{{ swift_system_user_name }}\tsoft\tnofile\t\t{{ swift_soft_open_file_limits }}"
-    insertbefore: "^# End of file"
-
-- name: Configure hard file limits
-  lineinfile:
-    dest: "/etc/security/limits.conf"
-    regexp: "^{{ swift_system_user_name }}.*hard.*nofile.*"
-    state: "present"
-    line: "{{ swift_system_user_name }}\thard\tnofile\t\t{{ swift_hard_open_file_limits }}"
-    insertbefore: "^# End of file"

templates/swift-systemd-init.j2

@@ -8,6 +8,7 @@ After=network.target
 Type=simple
 User={{ swift_system_user_name }}
 Group={{ swift_system_group_name }}
+LimitNOFILE={{ swift_soft_open_file_limits }}:{{ swift_hard_open_file_limits }}
 
 {% if swift_pypy_enabled %}
 {%   if swift_pypy_gc_min is defined %}