Revert "Raise number of nailgun uWSGI workers and sockets"

Revert necessary because of trying to set sysctl inside unprivileged container.
This reverts commit 88a8b82db851434bca098918eda644074b24943f.

Change-Id: I0ef7f6e760f040728c15593da2bab278ed437e10
Merge "Revert "Raise number of nailgun uWSGI workers and sockets"" into stable/5.1