MACRelayUnit: added liifecycle support
EtherSwitch: added lifecycle support
EtherHost: changed submodule positions
EtherHost lifecycle test: added switch on/off, modified timings
Radio: bugfix: was a segfault when Radio module started at DOWN
module tests: udpapp lifecycle tests use PPP instead EthernetNic

for tests PPP interface, too
EtherHost lifecycle test: added more checks
module tests: added more texts for descriptions
lifecycle tests: added ppp and eth interfaces

tested EtherMAC and EtherMACFullDuplex modules, too
added more lifecycle tests for wireless nodes
pingapp module test: added more conditions