[Dashboard] Start the new dashboard (#10131)

* Use new dashboard if environment var RAY_USE_NEW_DASHBOARD exists; new dashboard startup

* Make fake client/build/static directory for dashboard

* Add test_dashboard.py for new dashboard

* Travis CI enable new dashboard test

* Update new dashboard

* Agent manager service

* Add agent manager

* Register agent to agent manager

* Add a new line to the end of agent_manager.cc

* Fix merge; Fix lint

* Update dashboard/agent.py

Co-authored-by: SangBin Cho <rkooo567@gmail.com>

* Update dashboard/head.py

Co-authored-by: SangBin Cho <rkooo567@gmail.com>

* Fix bug

* Add tests for dashboard

* Fix

* Remove const from Process::Kill() & Fix bugs

* Revert error check of execute_after

* Raise exception from DashboardAgent.run

* Add more tests.

* Fix compile on Linux

* Use dict comprehension instead of dict(generator)

* Fix lint

* Fix windows compile

* Fix lint

* Test Windows CI

* Revert "Test Windows CI"

This reverts commit 945e01051ec95cff5fcc1c0bc37045b46e7ad9a6.

* Fix ParseWindowsCommandLine bug

* Update src/ray/util/util.cc

Co-authored-by: Robert Nishihara <robertnishihara@gmail.com>

Co-authored-by: 刘宝 <po.lb@antfin.com>
Co-authored-by: SangBin Cho <rkooo567@gmail.com>
Co-authored-by: Robert Nishihara <robertnishihara@gmail.com>

python/setup.py

@@ -133,6 +133,7 @@ extras["all"] = list(set(chain.from_iterable(extras.values())))
 # the change in the matching section of requirements.txt
 install_requires = [
     "aiohttp",
+    "aiohttp_cors",
     "aioredis",
     "click >= 7.0",
     "colorama",
@@ -408,7 +409,7 @@ def api_main(program, *args):
             nonlocal result
             if excinfo[1].errno != errno.ENOENT:
                 msg = excinfo[1].strerror
-                logger.error("cannot remove {}: {}" % (path, msg))
+                logger.error("cannot remove {}: {}".format(path, msg))
                 result = 1
 
         for subdir in CLEANABLE_SUBDIRS: