corosync link issue

[liangxin1300]

1. Completer of crm corosync link remove not works
2. When giving out the range index for the remove command, just log an error, it's better not to exit the whole crmsh

crm(live/alp-1)corosync link# remove 12
ERROR: list index out of range
bye

another example, should give the same error log message:

crm(live/alp-1)corosync link# update 2 alp-1=20.20.20.61 alp-2=20.20.20.62
ERROR: corosync.link.update: Link 2 does not exist.
crm(live/alp-1)corosync link# update 11 alp-1=20.20.20.61 alp-2=20.20.20.62
ERROR: list index out of range
bye

3. Build status is failed now in https://build.opensuse.org/package/show/network:ha-clustering:Factory/crmsh

[liangxin1300]

@nicholasyang2022 Please take a look, thanks!