Py3-only: Change str encoding from Python2 to only support Python3

Note by Bernhard: As per the agreement with Andrew in #18, we shall
keep master py2-compatible and py3-only changes go to a py3 branch:

Andrew wrote:
> However, master needs to remain atomically py2 or py3 compatible,
> and not a mix of fixes which leaves it broken in both. [...]
> please keep all commits which break compatibility with py2 in a
> separate single PR so it can be merged all in one go.
> The final commit on the py3 branch should [...]
Reference:
#18 (comment)

Therefore, I'll squash this commit with the next commit for fixing
it up keep master py2-compatible, at least until all py3 checks and
a complete manual test was done by QA.

Original commit message by Qin Zhang （张琴）:
Remove the use of 'encode' as it's used to turn a Unicode string into a regular string in Python2

Final Remarks by Bernhard, for completeleness:
- This commit also adds conversion from curses input bytes to str.
- Rebased to apply on the current master branch.

Co-authored-by: Bernhard Kaindl <bernhard.kaindl@cloud.com>
Signed-off-by: Qin Zhang （张琴） <qin.zhang@citrix.com>

XSConsoleCurses.py

@@ -278,11 +278,11 @@ def Snapshot(self):
         if self.title != "":
             retVal.append(self.title)
         if self.hasBox:
-            for i in range(1, self.ySize-1):
-                retVal.append(self.win.instr(i, 1, self.xSize-2))
+            for i in range(1, self.ySize - 1):
+                retVal.append(self.win.instr(i, 1, self.xSize - 2).decode('utf-8'))
         else:
             for i in range(self.ySize):
-                retVal.append(self.win.instr(i, 0, self.xSize))
+                retVal.append(self.win.instr(i, 0, self.xSize).decode('utf-8'))
 
         return retVal
 

plugins-base/XSFeatureSRCommon.py

@@ -211,7 +211,7 @@ def UpdateFieldsINITIAL(self):
         pane.ResetFields()
 
         sr = HotAccessor().sr[self.srHandle]
-        srName = sr.name_label(None).encode('utf-8')
+        srName = sr.name_label(None)
         if srName is None:
             pane.AddTitleField(Lang("The Virtual Machine is no longer present"))
         else:
@@ -226,7 +226,7 @@ def UpdateFieldsCONFIRM(self):
         pane.ResetFields()
 
         sr = HotAccessor().sr[self.srHandle]
-        srName = sr.name_label(None).encode('utf-8')
+        srName = sr.name_label(None)
         if srName is None:
             pane.AddTitleField(Lang("The Storage Repository is no longer present"))
         else:
@@ -282,7 +282,7 @@ def Commit(self):
         Layout.Inst().PopDialogue()
 
         operationName = SRUtils.OperationName(self.operation)
-        srName = HotAccessor().sr[self.srHandle].name_label(Lang('<Unknown>')).encode('utf-8')
+        srName = HotAccessor().sr[self.srHandle].name_label(Lang('<Unknown>'))
         messagePrefix = operationName + Lang(' operation on ') + srName + ' '
         Layout.Inst().TransientBanner(messagePrefix+Lang('in progress...'))
         try:

plugins-base/XSFeatureVMCommon.py

@@ -169,7 +169,7 @@ def UpdateFieldsINITIAL(self):
         pane.ResetFields()
 
         vm = HotAccessor().guest_vm[self.vmHandle]
-        vmName = vm.name_label(None).encode('utf-8')
+        vmName = vm.name_label(None)
         if vmName is None:
             pane.AddTitleField(Lang("The Virtual Machine is no longer present"))
         else:
@@ -190,7 +190,7 @@ def UpdateFieldsCONFIRM(self):
         pane.ResetFields()
 
         vm = HotAccessor().vm[self.vmHandle]
-        vmName = vm.name_label(None).encode('utf-8')
+        vmName = vm.name_label(None)
         if vmName is None:
             pane.AddTitleField(Lang("The Virtual Machine is no longer present"))
         else:
@@ -252,7 +252,7 @@ def Commit(self):
         Layout.Inst().PopDialogue()
 
         operationName = VMUtils.OperationName(self.operation)
-        vmName = HotAccessor().guest_vm[self.vmHandle].name_label(Lang('<Unknown>')).encode('utf-8')
+        vmName = HotAccessor().guest_vm[self.vmHandle].name_label(Lang('<Unknown>'))
         messagePrefix = operationName + Lang(' operation on ') + vmName + ' '
         try:
             task = VMUtils.AsyncOperation(self.operation, self.vmHandle, *self.opParams)