Empty filesystems for creating tests. Using these is _much_ faster than

using "dd" to create an empty file and then mkfs to create the filesystem.
They are also highly compressed (1000:1) so they don't use much space.

The new_fs() helper in common.sh will use these files instead of dd+mkfs
if they match the parameters given to new_fs().

diff --git a/lustre/tests/ext2_10000.gz b/lustre/tests/ext2_10000.gz
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diff --git a/lustre/tests/ext2_25000.gz b/lustre/tests/ext2_25000.gz
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index 0000000..122ed79
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diff --git a/lustre/tests/ext3_10000.gz b/lustre/tests/ext3_10000.gz
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index 0000000..b372fbd
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