tests/docker: shallow clone git repos
tests/docker: shallow clone git repos

In order to speed up the process, use shallow clones of the dependency
git repositories tpm2-tss and tpm2-abrmd instead of full history clones.

Signed-off-by: Andreas Fuchs <622ac2c25087201462d23b927a044354eba8dded@sit.fraunhofer.de>

01org/tpm2.0-tools,01org/tpm2.0-tools,martinezjavier/tpm2-tools,01org/tpm2.0-tools,martinezjavier/tpm2-tools,martinezjavier/tpm2-tools,martinezjavier/tpm2-tools