LNT: Sort testsuites ascendingly

When running a large number of testsuites having them sorted
alphabetically makes them easier to find.

This also allows us to group testsuite by prefixing them with
language.

Reviewed By: thopre

Differential Revision: https://reviews.llvm.org/D93115

lnt/server/db/v4db.py

@@ -55,6 +55,8 @@ def _load_schemas(self):
                 continue
             tsdb = lnt.server.db.testsuitedb.TestSuiteDB(self, name, suite)
             self.testsuite[name] = tsdb
+        # Order testuites alphabetically to get groupings
+        self.testsuite = dict (sorted (self.testsuite.items()))
 
     def __init__(self, path, config, baseline_revision=0):
         # If the path includes no database type, assume sqlite.