Configuration for the ST Nucleo L152RE board was merged into
OpenOCD upstream. This commit changes scripts for flashing,
debugging and reseting to use this and removes RIOT's configuration
file.
In current updates OpenOCD split up stm32l.cfg into stm32l1.cfg and
stm32l0.cfg. This provides a check in openocd.cfg for this file so
openocd doesn't fail.