Problem
=======

--conf-base-port and several other integer command-line
and config-file options accept hex and octal notation like:

  --conf-base-port=0xff  // hex
  --conf-base-port=077   // octal

which in case of octal notation error prone and unintended.

They also don't report errors in case the values isn't completely
numeric like '1zzz'.

Root-cause is the use of:

- strtol(..., ..., 0);      // enable base detection
- strtol(..., nullptr, 10); // ignoring invalid input
- stol(...);                // ignoring invalid input

Affects at least:

* --conf-base-port
* routing.router_id
* routing.thread_stack_size
* metadata_cache.read_timeout
* metadata_cache.connect_timeout
* metadata_cache.use_gr_notifications
* http_server.http_port
* http_server.port
* http_server.xport
* http_server.ssl
* io.threads

Change
======

- report error if string isn't completely numeric
- report error if string is hex or octal.
- added tests for hex input

RB: 25672