--defaults-file option does not honor port

[1stone]

When using the --defaults-file option with an option file, a explicitly set port is not used.

With an defaults-file (dbconfig) like this

[client]
host=mydb.example.com
port=3307
user=bla
password=fasel

an invokation of mydumper --defaults-file=dbconfig ... is effectively connecting to port 3306 on that remote host, rather than the specified 3307.

[maxbube]

Hi @1stone ,

Thanks for the report, I will review this for the next release