Improved ijar shell tests

The ijar tests were a bit bloated so using our shell test framework
to separate those tests into individual function and enable sharding.
The ijar tests are still ~70s on a macbook with a SSD drive (compared
to ~140s before).

Those 70s are spent in tests that write big files and test ijar
behavior with those big files. In those tests, disk IOs dominate
time. Timing the various operation gave that jaring the 2.2Gb large
file takes ~17s each time (operation we do twice). Simply creating
that file takes approximatively 10s. Reducing the number of
operations in that test would reduce significantly its duration.
Unfortunately, that would reduce the coverage of the test.

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Change-Id: Idc817ab32b78b69bde8dd95ddedbcf6b9f12ee3f
MOS_MIGRATED_REVID=92723971

0 files changed, 0 insertions, 0 deletions