Merge lp://qastaging/~akopytov/percona-xtrabackup/test-suite-cleanups into lp://qastaging/percona-xtrabackup/2.0

test/bootstrap.sh (+88/-0)
test/experimental/bug408803.sh (+3/-5)
test/experimental/xb_race_drop.sh (+0/-2)
test/inc/common.sh (+57/-121)
test/run.sh (+117/-14)
test/t/bug606981.sh (+8/-6)
test/t/bug723097.sh (+2/-4)
test/t/bug723318.sh (+1/-2)
test/t/ib_csm_csv.sh (+3/-5)
test/t/ib_inc_myisam.sh (+7/-9)
test/t/ib_incremental.sh (+8/-9)
test/t/ib_partition.sh (+0/-4)
test/t/ib_specialchar.sh (+3/-6)
test/t/tar4ibd_symlink.sh (+3/-5)
test/t/xb_basic.sh (+3/-5)
test/t/xb_export.sh (+12/-8)
test/t/xb_incremental.sh (+7/-7)
test/t/xb_incremental_compressed.sh (+15/-13)
test/t/xb_parallel.sh (+3/-5)
test/t/xb_part_range.sh (+0/-3)
test/t/xb_partial.sh (+3/-4)
test/t/xb_stats.sh (+6/-8)
test/t/xb_stream.sh (+3/-5)
utils/build.sh (+3/-1)