Switch to use edk2-pytool-library UefiVariableSupportLib. (#362)

## Description

There are multiple copies of VariableSupportLib floating across repos,
mostly only supporting Windows.
Functionality has been consolidated into edk2-pytool-library version
0.21.7. Support for Linux has been added.

Switch ReadUefiVarsToConfVarList.py, PyRobotRemote.py, WrapAndSetSvd.py
and WriteConfVarListToUefiVars.py to use consolidated version from
edk2-pytool-library.

Removed local copies of VariableSupportLib.py

For each item, place an "x" in between `[` and `]` if true. Example:
`[x]`.
_(you can also check items in the GitHub UI)_

- [x] Impacts functionality?
- **Functionality** - Does the change ultimately impact how firmware
functions?
- Examples: Add a new library, publish a new PPI, update an algorithm,
...
- [ ] Impacts security?
- **Security** - Does the change have a direct security impact on an
application,
    flow, or firmware?
  - Examples: Crypto algorithm change, buffer overflow fix, parameter
    validation improvement, ...
- [ ] Breaking change?
- **Breaking change** - Will anyone consuming this change experience a
break
    in build or boot behavior?
- Examples: Add a new library class, move a module to a different repo,
call
    a function in a new library class in a pre-existing module, ...
- [ ] Includes tests?
  - **Tests** - Does the change include any explicit test code?
  - Examples: Unit tests, integration tests, robot tests, ...
- [ ] Includes documentation?
- **Documentation** - Does the change contain explicit documentation
additions
    outside direct code modifications (and comments)?
- Examples: Update readme file, add feature readme file, link to
documentation
    on an a separate Web page, ...

## How This Was Tested


## Integration Instructions

N/A

.cspell.json

@@ -133,6 +133,7 @@
       "nochange",
       "headerRef",
       "modea",
-      "modeb"
+      "modeb",
+      "uefivariablesupport"
   ]
 }

SetupDataPkg/SetupDataPkg.ci.yaml

@@ -94,7 +94,8 @@
           "prettyname",
           "efivars",
           "efivarfs",
-          "chattr"
+          "chattr",
+          "uefivariablesupport"
         ],                           # words to extend to the dictionary for this package
         "IgnoreStandardPaths": [],   # Standard Plugin defined paths that should be ignore
         "AdditionalIncludePaths": [] # Additional paths to spell check (wildcards supported)

SetupDataPkg/Tools/ReadUefiVarsToConfVarList.py

@@ -12,10 +12,7 @@
 import struct
 import uuid
 import ctypes
-if os.name == 'nt':
-    from SettingSupport.UefiVariablesSupportLib import UefiVariable
-else:
-    from SettingSupport.UefiVariablesSupportLinuxLib import UefiVariable
+from edk2toollib.os.uefivariablesupport import UefiVariable
 from VariableList import Schema, UEFIVariable, create_vlist_buffer
 
 

SetupDataPkg/Tools/SettingSupport/PyRobotRemote.py

@@ -55,18 +55,17 @@ def Run_Command_And_Return_Output(self, cmdline):
     def GetUefiVariable(self, name, guid, trim):
         UefiVar = UefiVariable()
         logging.info("Calling GetUefiVar(name='%s', GUID='%s')" % (name, "{%s}" % guid))
-        (rc, var, error_string) = UefiVar.GetUefiVar(name, guid)
+        (rc, var) = UefiVar.GetUefiVar(name, guid)
         var2 = var
         if (var is not None) and (trim == 'trim'):
             varlen = len(var)
             if varlen > 1:
                 var2 = var[0: varlen - 1]
-        return (rc, var2, error_string)
+        return (rc, var2, "")
 
     def SetUefiVariable(self, name, guid, attrs=None, contents=None):
         UefiVar = UefiVariable()
-        (rc, err, error_string) = UefiVar.SetUefiVar(name, guid, contents, attrs)
-        return rc
+        return UefiVar.SetUefiVar(name, guid, contents, attrs)
 
     def remote_ack(self):
         return True