0.15.2

Release 0.15.2 (2018-07-17)

Baseline: b93ae42

Cherry picks:

• 4b80f24:
  Add option to enable Docker sandboxing.
• 6b16352:
  Allow disabling the simple blob caches via CLI flag overrides.
• 4ec0a75:
  Use BUILD.bazel instead of BUILD for external projects
• 2ff8c5f:
  Release 0.15.0 (2018-06-26)
• 8ff87c1:
  Fix autodetection of linker flags
• c4622ac:
  Fix autodetection of -z linker flags
• d3228b6:
  remote: limit number of open tcp connections by default. Fixes
  #5491

Important changes:

• In remote caching we limit the number of open
  TCP connections to 100 by default. The number can be adjusted
  by specifying the --remote_max_connections flag.

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