[voqinbandif]To support inband port as front panel port (sonic-net#159)

Signed-off-by: vedganes <vedavinayagam.ganesan@nokia.com>

Inband port is avaialable in PORT table. But regular port handlings are
not applicable for Inband port. Changes in this PR for avoiding regular
port handling on Inband port.

sonic_platform_base/sonic_sfp/sfputilbase.py

@@ -15,7 +15,7 @@
     from natsort import natsorted
     from portconfig import get_port_config
     from sonic_py_common import device_info
-    from sonic_py_common.interface import backplane_prefix
+    from sonic_py_common.interface import backplane_prefix, inband_prefix
 
     from sonic_eeprom import eeprom_dts
     from .sff8472 import sff8472InterfaceId  # Dot module supports both Python 2 and Python 3 using explicit relative import methods
@@ -498,8 +498,8 @@ def read_porttab_mappings(self, porttabfile, asic_inst=0):
                 # so we use the port's position in the file (zero-based) as bcm_port
                 portname = line.split()[0]
 
-                # Ignore if this is an internal backplane interface
-                if portname.startswith(backplane_prefix()):
+                # Ignore if this is an internal backplane interface and Inband interface
+                if portname.startswith(backplane_prefix()) or portname.startswith(inband_prefix()):
                     continue
 
                 bcm_port = str(port_pos_in_file)

sonic_platform_base/sonic_sfp/sfputilhelper.py

@@ -14,7 +14,7 @@
     from natsort import natsorted
     from portconfig import get_port_config
     from sonic_py_common import device_info
-    from sonic_py_common.interface import backplane_prefix
+    from sonic_py_common.interface import backplane_prefix, inband_prefix
 
 except ImportError as e:
     raise ImportError("%s - required module not found" % str(e))
@@ -127,8 +127,8 @@ def read_porttab_mappings(self, porttabfile, asic_inst=0):
                 # so we use the port's position in the file (zero-based) as bcm_port
                 portname = line.split()[0]
 
-                # Ignore if this is an internal backplane interface
-                if portname.startswith(backplane_prefix()):
+                # Ignore if this is an internal backplane interface and Inband interface
+                if portname.startswith(backplane_prefix()) or portname.startswith(inband_prefix()):
                     continue
 
                 bcm_port = str(port_pos_in_file)