Merge branch 'bb/sh-scripts-cleanup'

Shell scripts clean-up.

* bb/sh-scripts-cleanup: (22 commits)
  git-quiltimport: avoid an unnecessary subshell
  contrib/coverage-diff: avoid redundant pipelines
  t/t9*: merge "grep | sed" pipelines
  t/t8*: merge "grep | sed" pipelines
  t/t5*: merge a "grep | sed" pipeline
  t/t4*: merge a "grep | sed" pipeline
  t/t3*: merge a "grep | awk" pipeline
  t/t1*: merge a "grep | sed" pipeline
  t/t9*: avoid redundant uses of cat
  t/t8*: avoid redundant use of cat
  t/t7*: avoid redundant use of cat
  t/t6*: avoid redundant uses of cat
  t/t5*: avoid redundant uses of cat
  t/t4*: avoid redundant uses of cat
  t/t3*: avoid redundant uses of cat
  t/t1*: avoid redundant uses of cat
  t/t0*: avoid redundant uses of cat
  t/perf: avoid redundant use of cat
  t/annotate-tests.sh: avoid redundant use of cat
  t/lib-cvs.sh: avoid redundant use of cat
  ...

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