Make each step of Bazel install a distinct command
Make each step of Bazel install a distinct command

This causes the build to fail if any step of the Bazel install fails.
Previously, if any part of the install failed, the build would continue
regardless.

AlCutter/trillian,gdbelvin/trillian,AlCutter/trillian,gdbelvin/trillian,RJPercival/trillian,google/trillian,gdbelvin/trillian,google/trillian,RJPercival/trillian