board get_sdk scripts were left on python2

Author: rbiasini

board/get_sdk.sh

@@ -1,3 +1,3 @@
 #!/bin/bash
 sudo apt-get install gcc-arm-none-eabi python-pip
-sudo pip2 install libusb1 pycrypto requests
+sudo pip install libusb1 pycrypto requests

board/get_sdk_mac.sh

@@ -2,4 +2,4 @@
 # Need formula for gcc
 brew tap ArmMbed/homebrew-formulae
 brew install python dfu-util arm-none-eabi-gcc
-pip2 install libusb1 pycrypto requests
+pip install libusb1 pycrypto requests