[conformal/btcdb] 27bc18: Switch test coverage tool to new 'go tool cover'.

[Dave Collins]

  Branch: refs/heads/master
  Home:   https://github.com/conformal/btcdb
  Commit: 27bc18ba2efc9d331c446c05d372511897cc9bc5
      
https://github.com/conformal/btcdb/commit/27bc18ba2efc9d331c446c05d372511897cc9bc5
  Author: Dave Collins <da...@conformal.com>
  Date:   2014-01-19 (Sun, 19 Jan 2014)

  Changed paths:
    M cov_report.sh
    M test_coverage.txt

  Log Message:
  -----------
  Switch test coverage tool to new 'go tool cover'.

Also, make the coverage report test ldb and memdb instead of just sqlite3.