* A new abstract generic base class EPC is created
* srsEPC and AmarisoftEPC inherit from that class
* options are loaded from defaults.conf in cascade. First generic "epc",
afterwards the specific enb type.
* A new scenario is added to select the EPC type to use. srsEPC is the
default unless stated by an scenario.
* AmarisoftEPC delegates setup of the tun IP address to an "ifup"
script. As a result, since we run without root permissions (ony with
CAP_NET_ADMIN), the ifup script itself is unablet o set the IP
address. To solve this, we introduce a new osmo-gsm-tester helper
script which must be installed in the slave node which can be called
through sudo to increase privileges to do so.
With this commit, I can already get srsUE<->amarisoftENB<->amarisoftEPC
to pass ping and iperf3 4g tests.
Change-Id: Ia50ea6a74b63b2d688c8d683aea11416ad40a6d3
