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Set MTU on Linux (Ubuntu)

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If the MTU is being set by DHCP, we can override that with some changes to /etc/dhcp/dhclient.conf

```option rfc3442-classless-static-routes code 121 = array of unsigned integer 8;send host-name = gethostname();#added these two lines before the request linedefault interface-mtu 1500;supercede interface-mtu 1500;request subnet-mask, broadcast-address, time-offset, routers,        domain-name, domain-name-servers, domain-search, host-name,        dhcp6.name-servers, dhcp6.domain-search,        netbios-name-servers, netbios-scope, interface-mtu,        rfc3442-classless-static-routes, ntp-servers,        dhcp6.fqdn, dhcp6.sntp-servers;


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