mke2fs, libext2fs: make filesystem image reproducible

Override fs->now with env E2FSPROGS_FAKE_TIME
Override hash seed with -E hash_seed=<uuid>

Bug: 64994964
Change-Id: If1af7e990b5bf2939a7d5f2a9986406e12c294e9
(cherry picked from commit 3164c7644fd096a1ed88cdbe888fca0702ef7415)
3 files changed