support ipv6

[huayucai]

Proposed changes

Issue Number: close #xxx

Problem Summary:

1. In ipv6 enviromenet the packages which are about to be installed can not be distributed to the agent when the server does the scp operation. The same problen happens when server does the ssh operation
2. when check the current value of configuration , the ip information only show part of the ipv6 address because of using the "indexof(':') " funtion, and there are many ':' in ipv6 address

Checklist(Required)

1. Does it affect the original behavior: (Yes/No/I Don't know)
2. Has unit tests been added: (Yes/No/No Need)
3. Has document been added or modified: (Yes/No/No Need)
4. Does it need to update dependencies: (Yes/No)
5. Are there any changes that cannot be rolled back: (Yes/No)

Further comments

If this is a relatively large or complex change, kick off the discussion at dev@doris.apache.org by explaining why you chose the solution you did and what alternatives you considered, etc...