add config port support

support like 0.0.0.0:10022;
default port is 22;
config in pb-repo/.pb/remotes/origin
這麼寫可以讓 code 精簡些, 不用動到 IFS
```BASH
local -i _port=${_remote#*:}
if [[ 0 == $_port ]]; then
    _port=22
fi
_remote=${_remote%:*}```

local -i 或是 declare -i 宣告一個 integer 變量, 給值時 parse 失敗的話則結果為 0