BaseTools/Scripts/GetMaintainer: Sort output addresses

REF: https://bugzilla.tianocore.org/show_bug.cgi?id=4593

Sort the list of output addresses alphabetically so this
script produces the same output even if the order of patches
in a patch series is modified such that that order of files
processed by this script changes.

Use set() logic instead of OrderedDict to accumulate the
list of unique addresses that are sorted alphabetically.

Cc: Rebecca Cran <rebecca@bsdio.com>
Cc: Liming Gao <gaoliming@byosoft.com.cn>
Cc: Bob Feng <bob.c.feng@intel.com>
Cc: Yuwei Chen <yuwei.chen@intel.com>
Cc: Leif Lindholm <quic_llindhol@quicinc.com>
Signed-off-by: Michael D Kinney <michael.d.kinney@intel.com>
Acked-by: Rebecca Cran <rebecca@bsdio.com>
Reviewed-by: Leif Lindholm <quic_llindhol@quicinc.com>

BaseTools/Scripts/GetMaintainer.py

@@ -192,14 +192,16 @@ def get_modified_files(repo, args):
     else:
         FILES = get_modified_files(REPO, ARGS)
 
-    ADDRESSES = []
-
+    # Accumulate a sorted list of addresses
+    ADDRESSES = set([])
     for file in FILES:
         print(file)
         recipients = get_maintainers(file, SECTIONS)
-        ADDRESSES += recipients['maintainers'] + recipients['reviewers'] + recipients['lists']
+        ADDRESSES |= set(recipients['maintainers'] + recipients['reviewers'] + recipients['lists'])
+    ADDRESSES = list(ADDRESSES)
+    ADDRESSES.sort()
 
-    for address in list(OrderedDict.fromkeys(ADDRESSES)):
+    for address in ADDRESSES:
         if '<' in address and '>' in address:
             address = address.split('>', 1)[0] + '>'
         print('  %s' % address)