Issue Description:

Looks like a simple missing import in some python module:

ERROR: test_attach_to_process_by_id_denied_dwo (TestAttachDenied.AttachDeniedTestCase)
Test attach by process id denied

Traceback (most recent call last):
File "/home/buildnode/jenkins/workspace/oss-lldb-incremental-linux-ubuntu-14_04/lldb/packages/Python/lldbsuite/test/lldbtest.py", line 1480, in dwo_test_method
return attrvalue(self)
File "/home/buildnode/jenkins/workspace/oss-lldb-incremental-linux-ubuntu-14_04/lldb/packages/Python/lldbsuite/test/decorators.py", line 123, in wrapper
func(*args, **kwargs)
File "/home/buildnode/jenkins/workspace/oss-lldb-incremental-linux-ubuntu-14_04/lldb/packages/Python/lldbsuite/test/functionalities/process_attach/attach_denied/TestAttachDenied.py", line 38, in test_attach_to_process_by_id_denied
pid = lldbutil.wait_for_file_on_target(self, pid_file_path)
File "/home/buildnode/jenkins/workspace/oss-lldb-incremental-linux-ubuntu-14_04/lldb/packages/Python/lldbsuite/test/lldbutil.py", line 1064, in wait_for_file_on_target
time.sleep(pow(2, i) * 0.25)
NameError: global name 'time' is not defined
Config=x86_64-/usr/lib/llvm-3.6/bin/clang