dvc: remove dvc.py and fix bin/dvc*

bin/dvc and bin/dvc.bat are convenience scripts that can call
dvc without dvc.py, as dvc package has __main__.py anyway.

Signed-off-by: Ruslan Kuprieiev <[email protected]>

bin/dvc

@@ -1,3 +1,3 @@
 #!/bin/bash
 
-PYTHONPATH=$DVC_HOME python $DVC_HOME/dvc.py $@
+PYTHONPATH=$DVC_HOME python -m dvc $@

bin/dvc.bat

@@ -1,3 +1,3 @@
 @echo OFF
 set PYTHONPATH=%DVC_HOME%
-python %DVC_HOME%/dvc.py %*
+python -m dvc %*

dvc.py

@@ -1,6 +0,0 @@
-import sys
-
-from dvc.main import main
-
-if __name__ == "__main__":
-    main(sys.argv[1:])