Use newConfig more consistently when apply initial configuration
Use newConfig more consistently when apply initial configuration

This block of code has for loops that shadow the variable `c` declared
above it. This commit makes the scoping a little clearer by using
newConfig where possible to avoid the ambiguity.

fujita/gobgp,j-kato/gobgp,osrg/gobgp,fujita/gobgp,a16/gobgp,j-kato/gobgp,fujita/gobgp,j-kato/gobgp,a16/gobgp,a16/gobgp,a16/gobgp,a16/gobgp,osrg/gobgp,osrg/gobgp,a16/gobgp,osrg/gobgp,a16/gobgp,fujita/gobgp