Disable osprofiler by default

This could cause issues when upgrading to juno, since if config files are not
updated osprofiler can crash.

It is disabled by default in other services, such as cinder and heat.

Change-Id: Ide1be0d42e9e3640560564005b2ce1ffdf554e25
Closes-Bug: #1387320
(cherry picked from commit 090cb56ba100d53dc7c95148dde77a8a4969adfe)