Bug#184495: libc6.postinst needs to restart postgres

[Adam Heath <doogie@brainfood.com>]

package: libc6
version: 2.3.1-14
severity: serious

Postgres(according to lsof) keeps open libnss_compat.  Since this library
opens and closes the modules, and upgrading libc6 will change those modules,
postgres can break.

Please restart postgres in the postinst.

Severity serious, as it affects an unrelated package.

ps: I have not seen this problem, but was doing some checks before upgrading
an older server(which in the end didn't need to be upgraded anyways).