Add preempt_delay

[albatross0]

vrrp_instance block can contain preempt_delay.

[yuuki]

You need to add preempt_delay token process to not only lexer, but parser.

• https://github.com/yuuki/gokc/blob/ffc16c3/parser/parser.go.y#L20
• https://github.com/yuuki/gokc/blob/ffc16c3/parser/parser.go.y#L103

[albatross0]

There seems to be preempt_delay in my changes.
98f4063#diff-f1b1e43e23584d9b04a4c2f0263abd27

Is it not enough ?

[yuuki]

Sorry, I missed some files changes...
LGTM! thanks!