iocinf.cpp: Hostnames may be longer than 32 bytes

Found here at ESS:

(all in one line)
EPICS_CA_ADDR_LIST=averylonghostname.mylabnetwork.technicalnetwork.example.com
EPICS_CA_AUTO_ADDR_LIST=NO
caget somePVnam

leads to something like this:
CA.Client.Exception...............................................
    Warning: "Empty PV search address list"
    Source File: ../udpiiu.cpp line 403
    Current Time: Thu Jun 09 2022 10:10:47.804161447

Problem desription:
addAddrToChannelAccessAddressList() will collect what ever we specify in
EPICS_CA_ADDR_LIST for channel access.
That function will add IP-addresses to the search list.
hostnames are possible, but are ignored if longer than 32 bytes,
because buf is too short.

If a hostname can be resolved into an IP, that is fine,
if not that is "fine as well" (better say: silently ignored):
If, and only if, EPICS_CA_AUTO_ADDR_LIST=NO is given then the one
and only too long hostname will be ignored and lead to an
"Empty PV search address list".

If EPICS_CA_AUTO_ADDR_LIST=YES (or nothing) is specified, the search list
is not empty, and EPICS will search all broadcast addresses.
This will eventually lead into a timout.

Solution:
Increase the buf size in addAddrToChannelAccessAddressList() from 32 to 256

The maximum length for a hostname is 255:
https://www.ietf.org/rfc/rfc1034.txt

If we add one byte for the string terminating '\0', we need 256 bytes.

And yes, this patch neglets the fact that a user can specify HOSTNAME:PORT,
which may need another 6 bytes. To put it the other way around:
In this case the hostname length is limited to 250 bytes,
which is still long enough in practice.

modules/ca/src/client/iocinf.cpp

@@ -79,7 +79,7 @@ extern "C" int epicsStdCall addAddrToChannelAccessAddressList
     const char *pStr;
     const char *pToken;
     struct sockaddr_in addr;
-    char buf[32u]; /* large enough to hold an IP address */
+    char buf[256u]; /* large enough to hold an IP address or hostname */
     int status, ret = -1;
 
     pStr = envGetConfigParamPtr (pEnv);