Stratum Support for Segement Rounting Suite

- Add Stratum Bmv2 switch support for SRDhcpRelay and SRRouting tests
- Add Support for 0x1 topology on a Stratum Tofino HW switch
- Support for dockerized mininet with Stratum BMv2 switches
- Update scapy driver to work with newer versions of scapy
- Simple parsing for scapy ping output
- Add support for fetching and installing external onos apps
- Add support for onos-diagnostics profiles
- Move onos log levels to params file
- Add onos cfg settings to SR tests

Change-Id: I7c4a71484c8fd5735da9ef09b96d8990283b199b
(cherry picked from commit bef6d9bd943996483fed32130cb30ad26a06aac0)
diff --git a/TestON/drivers/common/cli/emulator/mininethostdriver.py b/TestON/drivers/common/cli/emulator/mininethostdriver.py
index 360fd9a..7c87136 100644
--- a/TestON/drivers/common/cli/emulator/mininethostdriver.py
+++ b/TestON/drivers/common/cli/emulator/mininethostdriver.py
@@ -22,13 +22,8 @@
 
 import pexpect
 import re
-import sys
-import types
 import os
-import time
-from math import pow
 from drivers.common.cli.emulatordriver import Emulator
-from core.graph import Graph
 
 
 class MininetHostDriver( Emulator ):
@@ -82,10 +77,11 @@
                 pwd=self.pwd )
 
             if self.handle:
-                main.log.info( "Connection successful to the " +
+                main.log.info( "Connection successful to " +
                                self.user_name +
                                "@" +
                                self.ip_address )
+                self.handle.sendline( "bash -i" )
                 self.handle.sendline( "~/mininet/util/m " + self.shortName )
                 self.handle.sendline( "cd" )
                 self.handle.expect( self.hostPrompt )