init.d/vzeventd-gentoo: fix starting, handle compiled in vzevent

(1) Source /etc/conf.d/vz so we know value of VIRTUOZZO and do not
    fail in check_config()

(2) Allow it to work when modules are built in (MODULES_DISABLED=yes).
Set /sys/module/vzevent/parameters/reboot_event=1 on service startup.

(3) Cleanups: indentation fixes, use ${VAR} not $VAR.

Fixes Gentoo bugs:
http://bugs.gentoo.org/show_bug.cgi?id=361453
http://bugs.gentoo.org/show_bug.cgi?id=361457

http://bugzilla.openvz.org/1827

[kir@openvz.org: better changelog entry]
1 file changed