When commands executed in a subshell fail the error message is lost.
Easy-RSA error log provides a permanent temp-file to write those
error messages to and be displayed on completion of the script.
This first use of the log-file by easyrsa_mktemp(), will log errors
caused by requiring more than three (3) subshell temp-files.
Temp-files created during a subshell command do not update the
temp-file counter, so their name relies on a second, built-in
extension to the temp-file name. If this second extension exceeds
three (3) then a non-fatal warning is logged to the error log-file.
Other functions, which are executed in subshells, will use the error
log-file in follow up patches, as required.
Signed-off-by: Richard T Bonhomme <tincantech@protonmail.com>
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