[sonic_pcie][sonic_ssd] Make Python 3-compliant (sonic-net#150)

Changes to make sonic_pcie and sonic_ssd packages Python 3-compliant.

Also remove unnecessary imports and remove executable permissions from files which should not be exectuable.

sonic_platform_base/sonic_pcie/pcie_common.py

@@ -27,8 +27,8 @@ def load_config_file(self):
             with open(config_file) as conf_file:
                 self.confInfo = yaml.load(conf_file)
         except IOError as e:
-            print "Error: {}".format(str(e))
-            print "Not found config file, please add a config file manually, or generate it by running [pcieutil pcie_generate]"
+            print("Error: {}".format(str(e)))
+            print("Not found config file, please add a config file manually, or generate it by running [pcieutil pcie_generate]")
             sys.exit()
 
     # load current PCIe device
@@ -40,11 +40,11 @@ def get_pcie_device(self):
         command1 = "sudo lspci"
         command2 = "sudo lspci -n"
         # run command 1
-        proc1 = subprocess.Popen(command1, shell=True, stdout=subprocess.PIPE)
+        proc1 = subprocess.Popen(command1, shell=True, universal_newlines=True, stdout=subprocess.PIPE)
         output1 = proc1.stdout.readlines()
         (out, err) = proc1.communicate()
         # run command 2
-        proc2 = subprocess.Popen(command2, shell=True, stdout=subprocess.PIPE)
+        proc2 = subprocess.Popen(command2, shell=True, universal_newlines=True, stdout=subprocess.PIPE)
         output2 = proc2.stdout.readlines()
         (out, err) = proc2.communicate()
 

sonic_platform_base/sonic_ssd/ssd_generic.py

@@ -7,10 +7,6 @@
 #  - StorFly
 #  - Virtium
 
-try:
-    import exceptions              # Python 2
-except ImportError:
-    import builtins as exceptions  # Python 3
 try:
     import re
     import subprocess
@@ -54,7 +50,7 @@ def __init__(self, diskdev):
         # Known vendor part
         if self.model:
             model_short = self.model.split()[0]
-            if self.vendor_ssd_utility.has_key(model_short):
+            if model_short in self.vendor_ssd_utility:
                 self.fetch_vendor_ssd_info(diskdev, model_short)
                 self.parse_vendor_ssd_info(model_short)
             else:
@@ -65,7 +61,7 @@ def __init__(self, diskdev):
             self.model = "Unknown"
 
     def _execute_shell(self, cmd):
-        process = subprocess.Popen(cmd.split(), stdout=subprocess.PIPE)
+        process = subprocess.Popen(cmd.split(), universal_newlines=True, stdout=subprocess.PIPE)
         output, error = process.communicate()
         return output