tls: more generic function to set cafile and capath

[cHuberCoffee]

No description provided.

[codecov]

Codecov Report

Merging #84 (dd3e5ec) into master (95c31d9) will increase coverage by 0.10%.
The diff coverage is 100.00%.

❗ Current head dd3e5ec differs from pull request most recent head 0acc49e. Consider uploading reports for the commit 0acc49e to get more accurate results

@@            Coverage Diff             @@
##           master      #84      +/-   ##
==========================================
+ Coverage   53.24%   53.35%   +0.10%     
==========================================
  Files         192      192              
  Lines       21459    21475      +16     
==========================================
+ Hits        11425    11457      +32     
+ Misses      10034    10018      -16     

Impacted Files	Coverage Δ
src/sys/fs.c	30.76% <100.00%> (+30.76%)	⬆️
src/tls/openssl/tls.c	29.20% <100.00%> (+1.54%)	⬆️
src/mbuf/mbuf.c	78.48% <0.00%> (-0.59%)	⬇️
src/main/main.c	55.04% <0.00%> (+0.12%)	⬆️
src/sip/strans.c	39.58% <0.00%> (+4.16%)	⬆️
src/dbg/dbg.c	42.59% <0.00%> (+5.20%)	⬆️

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[juha-h]

These should be improved:

 * @param cafile PEM file with CA certificate
 * @param capath Path containing CA certificates

Isn't it so that also cafile file can contain many ca certificates?

Path does not contain ca certificates, but files than contain ca certificates.