dirmngr: Use a default keyserver if none is explicitly set
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Description

dirmngr: Use a default keyserver if none is explicitly set

* configure.ac: Define DIRMNGR_DEFAULT_KEYSERVER.
* dirmngr/server.c (ensure_keyserver): Use it if no keyservers are set.
* doc/dirmngr.texi: Document this behavior.

A user who doesn't specify a keyserver, but asks gnupg to fetch a key
currently just gets a simple error messages "No keyserver available".

If the user is asking to contact a keyserver, we should have a
reasonable default, and not require them to fiddle with settings when
they might not know what settings to choose. This patch makes the
default hkps://hkps.pool.sks-keyservers.net.