[zorg] Add a step to run NDK update step to the scripted LLDB builder

[jesikmin]

Summary

This is an additional step to the lldb buildbots for automating NDKs to
the latest version.

[gkistanova]

Looks fine me.

[chying]

looks good.

.arcconfig

 {
   "project_id" : "zorg",
-  "conduit_uri" : "http://reviews.llvm.org/"
+  "conduit_uri" : "https://reviews.llvm.org/"
 }

zorg/buildbot/builders/LLDBBuilder.py

getShellCommandStep(f, name='checkout source code',
                                  WithProperties('%(revision)s')])
 
     # Set source revision
     f.addStep(SetProperty(name="set revision",
               command=[pathSep + 'getRevision' + scriptExt],
               property="got_revision",
               workdir="scripts"))
 
+    # Update NDK and create toolchains
+    getShellCommandStep(f, name='ndk download and toolchains update',
+                        command=[pathSep + 'updateToolChain' + scriptExt],
+                        description=["Update NDK toolchain"],
+                        flunkOnFailure=False,
+                        warnOnFailure=False)
+
     # Configure
     getShellCommandStep(f, name='cmake local',
                         command=[pathSep + 'cmake' + scriptExt])
 
     # Build
     getShellCommandStep(f, name='ninja build local',
                         command=[pathSep + 'buildLocal' + scriptExt])
     if buildAndroid: