Flatten directory structure

cascade-kinesis-client will be used as a submodule of other projects,
so it should not have "src/vmware.com/cascade-kinesis-client" in
its path. To build this project locally, please manually create
the parent folders.

Change-Id: I8844e6a0e32aae65b28496915d8507e9fb1058c6

HyperMake

@@ -86,8 +86,8 @@ targets:
     after:
       - toolchain
     watches:
-      - src/vendor/manifest
+      - vendor/manifest
-    workdir: src
+    workdir: .
     cmds:
       - gvt restore
 
@@ -95,5 +95,5 @@ settings:
   default-targets:
     - ci
   docker:
-    image: 'vmware/cascade-kcl-toolchain:latest'
+    image: 'vmware/cascade-toolchain:0.0.9'
-    src-volume: /home/cascade-kinesis-client
+    src-volume: /go/src/vmware.com/cascade-kinesis-client