Provide an accessor for the list of pool names

[christofchen]

• Program: dnsdist
• Issue type: Feature request

Short description

provide a CLI way to retrieve the list of pool names.

Usecase

i use multiple pools with caches. sometimes i need to remove an entry with expungeByName. Unfortunately i do not know in which cache the entry resides, so i would like to remove the entry from all caches.

Description

Having a function "getPoolNames()" returning a list of pools would hopefully allow something like this:
poolnames=getPoolNames() for i,v in ipairs(poolnames) do getPool(v):getCache():expungeByName("what.ever.name") end
to flush a name from all the caches.