Developer fixes VLAN bugs and adds a config file for switch setup

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A developer reran their code from the previous day and found bugs in the earlier VLAN support implementation, which they then went back to fix. They also found that setting up interfaces with a for-loop in main.cpp would not scale well for testing different VLAN configurations. To address this, they created a config.txt file storing the setup information, and both the Mininet bringup script and main.cpp now parse it to configure their objects. As a result, VLAN settings can be changed without recompiling the switch binary. The developer wrote 62 lines of code today and plans to write proper tests for current features tomorrow.

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