Fix for ubuntu18.04 (#657)
Fix for ubuntu18.04 (#657)

* Change to enable Thrift 0.9.2 to compile using Ubuntu 18.04

* Change install_deps.sh to use bash so string > comparison works

I have tested /bin/sh on Ubuntu, which is the dash shell, not bash,
and it doesn't seem to correctly implement > as string comparison.
bash does.

p4lang/behavioral-model,p4lang/behavioral-model,p4lang/behavioral-model,p4lang/behavioral-model,p4lang/behavioral-model