pmempool: fix mapping type in pool_params_parse

BZ: 1436820

commit 670e94e62d8dfdd9a66435dcf415b0a3fffc65c6
Author: Lukasz Dorau <lukasz.dorau@intel.com>
Date:   Wed Dec 14 16:58:03 2016 +0100

    pmempool: fix mapping type in pool_params_parse
    
    This change is required on account of DAX devices.

diff --git a/src/libpmempool/pool.c b/src/libpmempool/pool.c
index 6705bfe..7c4ec1a 100644
--- a/src/libpmempool/pool.c
+++ b/src/libpmempool/pool.c
@@ -349,7 +349,7 @@ pool_params_parse(const PMEMpoolcheck *ppc, struct pool_params *params,
 		}
 		params->size = (size_t)s;
 		addr = mmap(NULL, (uint64_t)params->size, PROT_READ,
-			MAP_PRIVATE, fd, 0);
+			MAP_SHARED, fd, 0);
 		if (addr == MAP_FAILED) {
 			ret = -1;
 			goto out_close;