BaseTools:Update mailing list address in BaseTools error messages

BZ:https://bugzilla.tianocore.org/show_bug.cgi?id=1815

The edk2 source tree contains four instances of the outdated mailing
list address "edk2-devel@lists.01.org".
I created a new variable, MSG_EDKII_MAIL_ADDR, to receive the
new email address and replaced the old one with this variable

Cc: Bob Feng <bob.c.feng@intel.com>
Cc: Liming Gao <liming.gao@intel.com>
Signed-off-by: Zhiju.Fan <zhijux.fan@intel.com>
Reviewed-by: Bob Feng <bob.c.feng@intel.com>

BaseTools/Source/Python/UPT/RmPkg.py

@@ -166,7 +166,7 @@ def Main(Options = None):
                     "\nRmPkg",
                     CODE_ERROR,
                     ST.ERR_UNKNOWN_FATAL_REMOVING_ERR,
-                    ExtraData=ST.MSG_SEARCH_FOR_HELP,
+                    ExtraData=ST.MSG_SEARCH_FOR_HELP % ST.MSG_EDKII_MAIL_ADDR,
                     RaiseError=False
                     )
         Logger.Quiet(ST.MSG_PYTHON_ON % (python_version(), platform) + \