posix: translate ENOMEM to ENOSPC when it's allowed

[marcinslusarz]

There are few cases when ENOSPC would make sense, but I don't see it specified as valid errno in applicable man page.

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This change is 

[krzycz]

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Reviewed 6 of 6 files at r1. Review status: all files reviewed at latest revision, all discussions resolved.

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Comments from Reviewable

[codecov[bot]]

Codecov Report

Merging #383 into master will decrease coverage by 0.05%. The diff coverage is 0%.

@@            Coverage Diff             @@
##           master     #383      +/-   ##
==========================================
- Coverage   76.91%   76.86%   -0.06%     
==========================================
  Files          67       67              
  Lines        8261     8273      +12     
  Branches     1658     1664       +6     
==========================================
+ Hits         6354     6359       +5     
- Misses       1489     1495       +6     
- Partials      418      419       +1

Flag	Coverage Δ
#ltp_tests	46.44% <0%> (+0.75%)	:arrow_up:
#sqlite_tests	45.17% <0%> (-0.09%)	:arrow_down:
#tests_antool	14.69% <0%> (-0.03%)	:arrow_down:
#tests_posix_multi_threaded	25.08% <0%> (-0.01%)	:arrow_down:
#tests_posix_single_threaded	54.19% <0%> (-0.13%)	:arrow_down:
#tests_preload	44.68% <0%> (-0.12%)	:arrow_down:

Impacted Files	Coverage Δ
src/libpmemfile-posix/mkdir.c	97.05% <0%> (-2.95%)	:arrow_down:
src/libpmemfile-posix/symlink.c	96.87% <0%> (-3.13%)	:arrow_down:
src/libpmemfile-posix/link.c	96.9% <0%> (-2.05%)	:arrow_down:
src/libpmemfile-posix/fallocate.c	60.46% <0%> (-1.44%)	:arrow_down:
src/libpmemfile-posix/file.c	74.72% <0%> (-0.42%)	:arrow_down:
src/libpmemfile-posix/rename.c	91.26% <0%> (-0.74%)	:arrow_down:
src/libpmemfile-posix/inode.c	88.31% <0%> (-0.35%)	:arrow_down:
src/libpmemfile-posix/data.c	94.02% <0%> (+0.39%)	:arrow_up:
src/libpmemfile-posix/block_array.c	96.77% <0%> (+2.41%)	:arrow_up:
src/libpmemfile-posix/blocks.c	70% <0%> (+5%)	:arrow_up:

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[sarahjelinek]

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Reviewed 6 of 6 files at r1. Review status: all files reviewed at latest revision, all discussions resolved, some commit checks failed.

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Comments from Reviewable

[sarahjelinek]

General comment... I am going to merge but do we need to add test cases for ENOSPC?

[marcinslusarz]

We definitely should. I don't have enough time now to do it properly and I didn't want to write trivial test just to get CodeCov green...