fix bug when using encoding

[shuaibingn]

when using encoding and logger in P4, this line will raise an exception, because the type of item in flatArgs is bytes, but bytes has no join.

self.logger.info("p4 " + " ".join(flatArgs))

so, we can initialize the logger after encoding

[shuaibingn]

this code will reproduce the problem

import logging

from P4 import P4

logger = logging.getLogger()

p4_config = {
    "port": "p4.com:1666",
    "user": "user",
    "password": "password",
}

p4 = P4(**p4_config)

p4.logger = logger
p4.encoding = "utf-8"

p4.connect()
p4.run_login()
p4.disconnect()

[ppiorunski]

Thank you for the PR