wa/workloads: Update to use threads parameter

Update workloads to use `threads` parameter to try and keep
configuration more consistent across workloads.

wa/workloads/meabo/__init__.py

@@ -148,8 +148,9 @@ class Meabo(Workload):
             default=range(1, 11),
         ),
         Parameter(
-            'num_threads',
+            'threads',
             kind=int,
+            aliases=['num_threads'],
             description='''
             Controls how many threads the application will be using.
             ''',
@@ -227,7 +228,7 @@ class Meabo(Workload):
         ('-x', 'num_palindromes'),
         ('-p', 'num_particles'),
         ('-R', 'num_randomloc'),
-        ('-T', 'num_threads'),
+        ('-T', 'threads'),
     ]
 
     def validate(self):

wa/workloads/sysbench/__init__.py

@@ -58,7 +58,7 @@ class Sysbench(Workload):
         Parameter('test', kind=str, default='cpu',
                   allowed_values=['fileio', 'cpu', 'memory', 'threads', 'mutex'],
                   description='sysbench test to run'),
-        Parameter('num_threads', kind=int, default=8,
+        Parameter('threads', kind=int, default=8, aliases=['num_threads'],
                   description='''
                   The number of threads sysbench will launch.
                   '''),
@@ -112,7 +112,7 @@ class Sysbench(Workload):
     def setup(self, context):
         self.host_results_file = None
         params = dict(test=self.test,
-                      num_threads=self.num_threads)
+                      num_threads=self.threads)
         if self.max_requests:
             params['max_requests'] = self.max_requests
         if self.max_time: