Add more channel number for detecting BMC IP address

IPMI SPEC[1] assignment channel number 1-11 for vendors
implementation(We an search "Channel Numbers" in section 6.3).
We met an baremetal product, like H3C, use number 8 as LAN channel.

Current code limit channel number to 1~7,
I think this can increase to 1~11.

[1] https://www.intel.com/content/dam/www/public/us/en/documents/product-briefs/ipmi-second-gen-interface-spec-v2-rev1-1.pdf

Change-Id: I63a6ff91d702b990ef09da13e6e2e269e7274cce
Task: 30654
Story: 2005528
(cherry picked from commit 66d3c8e453)

ironic_python_agent/hardware.py

@@ -1108,9 +1108,10 @@ class GenericHardwareManager(HardwareManager):
         utils.try_execute('modprobe', 'ipmi_si')
 
         try:
-            # From all the channels 0-15, only 1-7 can be assigned to different
-            # types of communication media and protocols and effectively used
-            for channel in range(1, 8):
+            # From all the channels 0-15, only 1-11 can be assigned to
+            # different types of communication media and protocols and
+            # effectively used
+            for channel in range(1, 12):
                 out, e = utils.execute(
                     "ipmitool lan print {} | awk '/IP Address[ \\t]*:/"
                     " {{print $4}}'".format(channel), shell=True)

releasenotes/notes/add-more-lan-channels-8f5197ed5f057c25.yaml

@@ -0,0 +1,7 @@
+---
+fixes:
+  - |
+    From IPMI specification v2.0, channel number 1-Bh(1-11) can
+    be used for various types of communications channels.
+    The respectively available channels depend on the specific
+    IPMI implementation for a specific server system.