fix quic_config_fn cfg cmd parse error

[fanxb]

The input argument parsed in the while loop should be line_input, not input

[edwarnicke]

Thank you so much for your interest! VPP actually takes patches at https://gerrit.fd.io/

git clone https://gerrit.fd.io/r/vpp

I would then recommend using git review to contribute patches.

[fanxb]

Okay, copy that.

[dwallacelf]

Thank you so much for your interest! VPP takes patches at https://gerrit.fd.io/

git clone https://gerrit.fd.io/r/vpp

Using git review to contribute patches is recommended