Let IPMI plugin skip periods "unsupported state" periods

On a server IPMI readings suddenly failed causing the plugin to stop
collecting data.
The following entries got logged:

ipmi plugin: sensor_read_handler: Removing sensor Temp 7 processor (3.6), because it failed with status 0x10000d5.
ipmi plugin: sensor_read_handler: Removing sensor Temp 6 processor (3.5), because it failed with status 0x10000d5.
ipmi plugin: sensor_read_handler: Removing sensor Temp 5 power_supply (10.5), because it failed with
status 0x10000d5.
ipmi plugin: sensor_read_handler: Removing sensor Temp 4 processor (3.4), because it failed with status 0x10000d5.
ipmi plugin: sensor_read_handler: Removing sensor Temp 3 processor (3.3), because it failed with status 0x10000d5.
ipmi plugin: sensor_read_handler: Removing sensor Temp 2 external_environment (39.1), because it
failed with status 0x10000d5.
ipmi plugin: sensor_read_handler: Removing sensor Temp 1 system_internal_expansion_board (16.1),
because it failed with status 0x10000d5.

This patch attempts to provide slightly better error message and just
skip current reading iteration if the error
IPMI_NOT_SUPPORTED_IN_PRESENT_STATE_CC is indicated.

This error happens e.g. when iLo firmware is upgraded (or reboots?) on
HP servers.

---
--- collectd-4.5.2/src/ipmi.c	2009-02-02 13:14:13.898736713 +0100
+++ collectd-4.5.2/src/ipmi.c	2009-02-02 13:21:58.987738365 +0100
 <at>  <at>  -148,11 +148,33  <at>  <at>  static void sensor_read_handler (ipmi_se
         }
       }
     }
+    else if (IPMI_IS_IPMI_ERR(err) && IPMI_GET_IPMI_ERR(err) == IPMI_NOT_SUPPORTED_IN_PRESENT_STATE_CC)