fix three minor typos in depends.py
fix three minor typos in depends.py

Change-Id: I3d007ec429c49b13d441b93f4703ce8a7f251f9b
Reviewed-on: http://gerrit.aldebaran.lan:8080/9830
Reviewed-by: dmerejkowsky <1e4b13000fa8777df4cefd2fd8215187e3deb062@aldebaran-robotics.com>
Tested-by: ckilner <3484075e8fc074f79e3af104726e0e82624120eb@aldebaran-robotics.com>

aldebaran/qibuild,dmerejkowsky/qibuild,aldebaran/qibuild,aldebaran/qibuild,dmerejkowsky/qibuild,dmerejkowsky/qibuild,dmerejkowsky/qibuild,dmerejkowsky/qibuild,aldebaran/qibuild