Major operations:
* Fix the go_package entries to be consistent, as the new tool
complains when it doesn't have a '/'.
* Regenerate with the new protoc-gen-go tool.
* github.com/golang/protobuf -> google.golang.org/protobuf
* proto.[Un]MarshalText -> prototext.[Un]Marshal
Change-Id: Ie1147bd2457fafb66ba555461b3bf14f0561a25d
The setup_go_workspace_for_soong now allows the reverse operation
of unbinding the directories of the previous operation. Also,
refactored the script to easily add more directories to bind/unbind
in the future, catch failures on running in subshell commands and
a cleaner way to find the repo top directory.
Bug: b/129407866
Test: Manually tested by running the script on binding and unbinding
the directories. Tested both darwin and linux OS.
Change-Id: I7c93230aeab819ab5747e990e95aa26077071d9e
