tools: frr-reload fix bgp nbr delete

tools: frr-reload fix bgp nbr delete

When a bgp neighbor removed from associated to peer-group,
the neighbor is fully deleted, subsequent deletion of any
configuration related to the neighbor leads to failure
in frr-reload.

Fix: In frr-reload lines to delete check if any neighbor with
peer-group removal line is present, if so then remove any
further config deletion associated the neighbor needs to removed
from the lines to delete.

Ticket:#3032234
Reviewed By:
Testing Done:

BEFORE FIX:
-----------
2022-04-08 20:03:32,734  INFO: Executed "router bgp 4200000005  no neighbor swp5 interface peer-group UNDERLAY"
2022-04-08 20:03:32,892  INFO: Failed to execute router bgp 4200000005  no neighbor swp5 password SSSS
2022-04-08 20:03:33,050  INFO: Failed to execute router bgp 4200000005  no neighbor swp5 password
2022-04-08 20:03:33,218  INFO: Failed to execute router bgp 4200000005  no neighbor swp5
2022-04-08 20:03:33,354  INFO: Failed to execute router bgp 4200000005  no neighbor
2022-04-08 20:03:33,520  INFO: Failed to execute router bgp 4200000005  no
2022-04-08 20:03:33,521 ERROR: "router bgp 4200000005 --  no" we failed to remove this command
2022-04-08 20:03:33,521 ERROR: % Specify remote-as or peer-group commands first

2022-04-08 20:03:33,691  INFO: Failed to execute router bgp 4200000005  no neighbor swp5 advertisement-interval 0
2022-04-08 20:03:33,853  INFO: Failed to execute router bgp 4200000005  no neighbor swp5 advertisement-interval
2022-04-08 20:03:34,015  INFO: Failed to execute router bgp 4200000005  no neighbor swp5
2022-04-08 20:03:34,145  INFO: Failed to execute router bgp 4200000005  no neighbor
2022-04-08 20:03:34,326  INFO: Failed to execute router bgp 4200000005  no
2022-04-08 20:03:34,327 ERROR: "router bgp 4200000005 --  no" we failed to remove this command
2022-04-08 20:03:34,327 ERROR: % Specify remote-as or peer-group commands first

AFTER FIX:
----------

delete of numbered neighbor:

2022-04-08 19:52:17,204  INFO: Executed "router bgp 4200000005  no
neighbor 1.2.3.4 peer-group UNDERLAY"
2022-04-08 19:52:17,205  INFO: /var/run/frr/reload-GRFX1M.txt content

delete of unnumbered neighbor:
2022-04-08 20:00:02,952  INFO: Executed "router bgp 4200000005  no
neighbor swp5 interface peer-group UNDERLAY"
2022-04-08 20:00:02,953  INFO: /var/run/frr/reload-722C3P.txt content

Signed-off-by: Chirag Shah <chirag@nvidia.com>