keepalived: enable reproducible-build

keepalived: enable reproducible-build

Before keepalived version '2.3.0' the compilation was not reproducable
because the compile date and other information has been added to the binary.

Starting with version '2.3.0', there is a new compilation option
'--enable-reproducible-build' that makes the binary reproducible.

The data that prevented this has been moved to a separate file,
'/etc/keepalived/keepalived.config-opts'.

This commit enables the reproducable build.

[1] https://github.com/acassen/keepalived/commit/30d2f759783e769c27974d22bab88f7e82dfcdf9

Signed-off-by: Florian Eckert <[email protected]>