Minor fixes

Author: madchutney

tools/host_tests/hello_auto.py

@@ -15,7 +15,6 @@
 limitations under the License.
 """
 
-class HelloTest():
 class HelloTest(object):
     HELLO_WORLD = "Hello World"
 

tools/host_tests/mbedrpc.py

@@ -29,7 +29,7 @@
 
 from future import standard_library
 standard_library.install_aliases()
-import serial, urllib.request, urllib.error, urllib.parse, time
+import serial, urllib.request, time
 
 # mbed super class
 class mbed(object):

tools/host_tests/tcpecho_client.py

@@ -26,7 +26,7 @@
 N_PACKETS = 5000
 TOT_BITS = float(LEN_PACKET * N_PACKETS * 8) * 2
 MEGA = float(1024 * 1024)
-UPDATE_STEP = N_PACKETS // 10
+UPDATE_STEP = (N_PACKETS // 10)
 
 class TCP_EchoClient(object):
     def __init__(self, host):

tools/host_tests/udpecho_client.py

@@ -26,7 +26,7 @@
 N_PACKETS = 5000
 TOT_BITS = float(LEN_PACKET * N_PACKETS * 8) * 2
 MEGA = float(1024 * 1024)
-UPDATE_STEP = N_PACKETS // 10
+UPDATE_STEP = (N_PACKETS // 10)
 
 class UDP_EchoClient(object):
     s = socket(AF_INET, SOCK_DGRAM)