[show]bgp]Display the Total number of neighbors in the show ip bgp(v6…

…) summary. (#1079)

Two minor Fixes to the done
- reset the os environ UTILITIES_UNIT_TESTING_TOPOLOGY multi_asic_intfutil_test after the test is done
 - add the line "Total number of neighbors" to the show ip(v6) bgp summary

Signed-off-by: Arvindsrinivasan Lakshmi Narasimhan <arlakshm@microsoft.com>

tests/bgp_commands_test.py

@@ -40,6 +40,8 @@
 10.0.0.59      4  64014          0          0         0      0       0  never      Active          ARISTA14T0
 10.0.0.61      4  64015          0          0         0      0       0  never      Active          ARISTA15T0
 10.0.0.63      4  64016          0          0         0      0       0  never      Active          ARISTA16T0
+
+Total number of neighbors 24
 """
 
 show_bgp_summary_v6 = """\
@@ -78,6 +80,8 @@
 fc00::72       4  64013          0          0         0      0       0  never      Active          ARISTA13T0
 fc00::76       4  64014          0          0         0      0       0  never      Active          ARISTA14T0
 fc00::a        4  65200       6665       6671         0      0       0  2d09h38m   6402            ARISTA03T2
+
+Total number of neighbors 24
 """
 
 show_error_invalid_json = """\

tests/multi_asic_intfutil_test.py

@@ -180,3 +180,4 @@ def teardown_class(cls):
         os.environ["PATH"] = os.pathsep.join(
             os.environ["PATH"].split(os.pathsep)[:-1])
         os.environ["UTILITIES_UNIT_TESTING"] = "0"
+        os.environ["UTILITIES_UNIT_TESTING_TOPOLOGY"] = ""

utilities_common/bgp_util.py

@@ -231,6 +231,8 @@ def display_bgp_summary(bgp_summary, af):
         click.echo("\n")
 
         click.echo(tabulate(natsorted(bgp_summary['peers']), headers=headers))
+        click.echo("\nTotal number of neighbors {}".
+                   format(len(bgp_summary['peers'])))
     except KeyError as e:
         ctx = click.get_current_context()
         ctx.fail("{} missing in the bgp_summary".format(e.args[0]))