misc: add a nerd knob to skip a sysctl during the .deb installation
misc: add a nerd knob to skip a sysctl during the .deb installation

In some cases, e.g. in the container installs, it's beneficial to skip
the sysctl portion of the installation.

This commit allows to do that by setting the environment variable
VPP_INSTALL_SKIP_SYSCTL.

Change-Id: If88468c5c45bf122e927f09e08560e25b73bf1f9
Type: feature
Signed-off-by: Andrew Yourtchenko <eb6233fe2fbd585844f4fb8426b53b186ab379b1@gmail.com>

chrisy/vpp,chrisy/vpp,FDio/vpp,chrisy/vpp,chrisy/vpp,FDio/vpp,chrisy/vpp,chrisy/vpp,FDio/vpp,FDio/vpp,FDio/vpp,chrisy/vpp,chrisy/vpp,FDio/vpp,FDio/vpp,FDio/vpp