add DeepMimic helper utils

examples/pybullet/gym/pybullet_utils/util.py

@@ -0,0 +1,13 @@
+import random
+import numpy as np
+
+def set_global_seeds(seed):
+    try:
+        import tensorflow as tf
+    except ImportError:
+        pass
+    else:
+        tf.set_random_seed(seed)
+    np.random.seed(seed)
+    random.seed(seed)
+    return