tox_install_project.sh: Use git clone --depth 1
tox_install_project.sh: Use git clone --depth 1

Copied from the similar change in neutron-fwaas [1] and
networking-midonet [2]

[1] Ib8964fc029a2eab839c8022ad48ef40541e83780
[2] Icc783c6b80372882e766c8da448ab7ceadf21a2a

Change-Id: I8c0cc82e6e0e65a2025eb1189d86668bf0a828fc
Co-Authored-By: Akihiro Motoki <e9c22966286dfb7b63536b5480a1a395590f8876@gmail.com>
Co-Authored-By: YAMAMOTO Takashi <458bba2e4a8704776b33478100c98529b639cd9e@midokura.com>

openstack/networking-odl,openstack/networking-odl,openstack/networking-odl