nginx-util: add tests, clean up and fix issues

Add tests for nginx-ssl-util and nginx-ssl-util-nopcre using (fake)chroot.
Clean the code up making nginx-ssl-util a header file.
Both changes are for better (future) code quality only.

There are minor functional improvements:
* fix compiler error of gcc7 by using std=c++17
* fix error if there is no lan/loopback interface
* notice instead of error message if there is no default server
* add ipv6-prefix-assignment.*.local-address.address for LAN
* add CONFLICTS in Makefile for choosing the right version
* add cast to release of unique_ptr to avoid warning
* add version message to help message

Signed-off-by: Peter Stadler <peter.stadler@student.uibk.ac.at>

net/nginx-util/src/test-px5g.sh

@@ -2,6 +2,7 @@
 
 PRINT_PASSED=2
 
+printf "Initializing tests ...\n"
 
 OPENSSL_PEM="$(mktemp)"
 OPENSSL_DER="$(mktemp)"
@@ -18,14 +19,14 @@ openssl req -x509 -nodes -days 1 -keyout /dev/null 2>/dev/null \
 
 
 function test() {
-    MSG="$1 >/dev/null \t (-> $2?) \t"
     eval "$1 >/dev/null "
     if [ $? -eq $2 ]
     then
-        [ "$PRINT_PASSED" -gt 0 ] && printf "$MSG passed.\n"
+        [ "${PRINT_PASSED}" -gt 0 ] \
+        && printf "%-72s%-1s\n" "$1" ">/dev/null (-> $2?) passed."
     else
-        printf "$MSG failed!!!\n"
-        [ "$PRINT_PASSED" -gt 1 ] && exit 1
+        printf "%-72s%-1s\n" "$1" ">/dev/null (-> $2?) failed!!!"
+        [ "${PRINT_PASSED}" -gt 1 ] && exit 1
     fi
 }