Introduce configuration file

[ligurio]

Possible formats:

• JSON (https://github.com/zserge/jsmn)
• INI
  • https://github.com/mariusae/trickle/blob/master/conf.c
  • https://github.com/benhoyt/inih
• XML

Configuration file should have number of sections each of them describes:

• field with type of fault injection:
  • [ ] errinj_remove (see #35)
  • [ ] errinj_truncate (see #34)
  • [ ] errinj_kill_caller kill process that run operation (see #28)
  • [ ] errinj_incomplete_write incomplete writes (see #27)
  • [ ] errinj_corrupted_write corrupted writes (see #8)
  • [ ] errinj_errno (random or fixed) (+ regex that describes what errors one desired to return) (see #6 #9)
  • [ ] errinj_noop replace operation with no-op for those operations where it possible (see #18)
  • [ ] errinj_delayed_op delay on operations (see #29)
  • [ ] errinj_clear_cache (see #57)
• field with probability (0-100%)
• field with regexp for filesystem path where fault injection should happen

For example:

[errinj_errno]
path_regexp = *.xlog
operation_regexp =
probability = 60

[errinj_noop]
path_regexp = *.*
operation_regexp =
probability = 30