Fix stress test failure due to write fault injections and disable write fault injection

[cbi42]

This PR contains two fixes:

1. disable write fault injection since it caused several other kinds of internal stress test failures. I'll try to fix those separately before enabling it again.
2. Fix segfault like

#5  0x000000000083dc43 in rocksdb::port::Mutex::Lock (this=0x30) at internal_repo_rocksdb/repo/port/port_posix.cc:80
80	internal_repo_rocksdb/repo/port/port_posix.cc: No such file or directory.
#6  0x0000000000465142 in rocksdb::MutexLock::MutexLock (mu=0x30, this=<optimized out>) at internal_repo_rocksdb/repo/util/mutexlock.h:37
37	internal_repo_rocksdb/repo/util/mutexlock.h: No such file or directory.
#7  rocksdb::FaultInjectionTestFS::DisableWriteErrorInjection (this=0x0) at internal_repo_rocksdb/repo/utilities/fault_injection_fs.h:505
505	internal_repo_rocksdb/repo/utilities/fault_injection_fs.h: No such file or directory.

Test plan: db_stress with no fault injection: ./db_stress --write_fault_one_in=0 --read_fault_one_in=0 --open_metadata_write_fault_one_in=0 --open_read_fault_one_in=0 --open_write_fault_one_in=0 --sync_fault_injection=0

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@cbi42 merged this pull request in ba5897a.