### Static network configuration for RTEMS targets using libBSD

GitHub [PR #853](https://github.com/epics-base/epics-base/pull/853)

RTEMS targets built against the libBSD network stack can now use a static
network configuration in addition to DHCP.

When a static IP address and netmask can be read from the board's boot
configuration, the first non-loopback interface is configured with that static
address; otherwise the target falls back to DHCP as before.

The boot configuration is read using the mechanism appropriate to the board:

 * MOTLOAD boards read the NVRAM Global Environment Variables (GEV), falling
   back to the parameters in the `mot-script-boot` boot script.
 * PPCBUG boards read their PPCBUG NVRAM.
 * ColdFire (`mcf528x`) boards read their bootloader environment variables.