salt: set source branch to nilrt/comms-3.0/2017.7
salt: set source branch to nilrt/comms-3.0/2017.7

Signed-off-by: Ken Sharp <e6c8ad8f54d15df4645e8aaf3f7a209bc3688570@ni.com>

ni/meta-nilrt,ni/meta-nilrt,ni/meta-nilrt,ni/meta-nilrt,ni/meta-nilrt