Install Guide: Use controller also for Ubuntu for sql_connection

We use for other distributions controller instead of localhost in
the connection string, use controller as well for Ubuntu

Change-Id: Ifd11c08300f10ed0dd50cd060afe03b3e6f18493
backport: havana
Closes-Bug: #1248603
Fixes NTP advices

Previously, the install-guide told about using the "ntpdate"
client in a cron job to update the time, which is a bad
advise. Also, it didn't tell how to install ntpdate either.
Using the ntp daemon is much better. This patch fixes that.

Change-Id: I6f624cf89d558bffcaee724e13274466a8fd3e2b
backport: havana
Ceilometer installation fixes

- MongoDB must be configured to accept connections on the public
  interface of the controller on (Open)SUSE and Debian/Ubuntu
- Fix wrong section name for the metering_key setting

Change-Id: I98a0278c08d40faa6f5f0a8c44f28bd17b274b32
backport: havana
curl to wget in verify image service installation

Changing "curl" to "wget" in "Verifying the Image Service installation"
 page. This is because Ubuntu doesn't include curl in the default
base/minimal installation.

Change-Id: I16364d05085a2a9c3713e94f71a3250215361540
Closes-Bug: #1248605
backport: havana
install guide: mysql needs to be restarted on debian/ubuntu

Change-Id: Ic8572e3d458a65a13dde142b4a3a27a419b5b9c5
backport: havana
Merge "Install Guide: Use controller also for Ubuntu for sql_connection"
Merge "Fixes NTP advices"
Merge "Ceilometer installation fixes"
Merge "install guide: mysql needs to be restarted on debian/ubuntu"
Merge "curl to wget in verify image service installation"