New Startup behavior related to the DHCP service availability

After a general cut in the electrical power supply, the switch can restart before than other generic systems (routeurs, serveurs, DHCP & NTP services,...).
It results that the switch might be not well configured if these services cannot be reached and especially the DHCP service.

So, a new behavior has been introduced to wait for the availability of the DHCP service (if configured) to get the source of the dot-config file and to setup the management port.