vmem: implementation of vmem_check

Validate pool consistency.
-Check wrong data in header
-Check not zeroed values inside a zeroed pages
-Check data structures are outside of memory region
-Check conflict memory regions between pools
Merge pull request #34 from spawlows/vmem-pool-check-merged

vmem: implementation of vmem_check
vmem: fix segfault in je_malloc() in multi-threaded applications

Due to the race condition in malloc_init_base_pool(), "base pool"
(aka "pool[0]") may be used when not yet initialized.
The problem is observed only for native je_malloc(). vmem_malloc()
and je_pool_malloc() are not affected.
Merge pull request #38 from krzycz/vmem-base_pool_init

vmem: fix segfault in je_malloc() in multi-threaded applications
blk: clear error flag when setting zero flag

Ref: pmem/issues#4
Merge pull request #40 from plebioda/btt-clear-error-flag-when-setting-zero-flag

blk: clear error flag when setting zero flag
common: fix format strings for off_t and uint64_t

This fixes some warnings when using 32-bit compiler.
common: make all calls to pthread_*() uniform

1) Make all calls to pthread_*() uniform:
   - *_lock() - set errno to return value, call LOG() and error out,
   - *_unlock() and *_init() - set errno to return value and call LOG()
2) Change return type of lane_exit() to static void.
Merge pull request #41 from krzycz/common-print_formats

common: fix format strings for off_t and uint64_t
common: fix date format in rpm changelog
blk: only one flag allowed at the time

- clear other flags when setting any flag
- add unit tests

Ref: pmem/issues#4
Merge pull request #39 from ldorau/blk-check-return-pthread_mutex_lock

common: make all calls to pthread_*() uniform
Merge pull request #42 from plebioda/fix-date-format

common: fix date format in rpm changelog
Merge pull request #43 from plebioda/btt-clear-error-flag-when-setting-zero-flag

blk: only one flag allowed at the time