Clean up test suite scripts

The test scripts have grown to be quite big (over 15000 lines) and
are hard to navigate. There are multiple if branches with over
40 conditional checks chained together. This commit solves some of
those issues.

 - Unite big repetetive if conditions into clean array lookups
 - Move 'install help' commands to a separate shell script
 - Adjust array lookup in test.sh to behave more intuitive
 - Add comments at key points to simplify navigation
 - Code formatting

tools/install_modules.sh

@@ -0,0 +1,65 @@
+#!/bin/bash
+
+##
+## Author......: See docs/credits.txt
+## License.....: MIT
+##
+
+## Test suite installation helper script
+
+# Sum of all exit codes
+ERRORS=0
+
+cpan install Authen::Passphrase::LANManager \
+             Authen::Passphrase::MySQL323   \
+             Authen::Passphrase::NTHash     \
+             Authen::Passphrase::PHPass     \
+             Convert::EBCDIC                \
+             Crypt::CBC                     \
+             Crypt::DES                     \
+             Crypt::Digest::RIPEMD160       \
+             Crypt::Digest::Whirlpool       \
+             Crypt::ECB                     \
+             Crypt::Eksblowfish::Bcrypt     \
+             Crypt::Mode::ECB               \
+             Crypt::MySQL                   \
+             Crypt::OpenSSH::ChachaPoly     \
+             Crypt::PBKDF2                  \
+             Crypt::RC4                     \
+             Crypt::Rijndael                \
+             Crypt::ScryptKDF               \
+             Crypt::Skip32                  \
+             Crypt::Twofish                 \
+             Crypt::UnixCrypt_XS            \
+             Digest::BLAKE2                 \
+             Digest::CMAC                   \
+             Digest::CRC                    \
+             Digest::GOST                   \
+             Digest::HMAC                   \
+             Digest::HMAC_MD5               \
+             Digest::Keccak                 \
+             Digest::MD4                    \
+             Digest::MD5                    \
+             Digest::Perl::MD5              \
+             Digest::SHA                    \
+             Digest::SHA3                   \
+             Digest::SipHash                \
+             JSON                           \
+             Net::DNS::RR::NSEC3            \
+             Net::DNS::SEC                  \
+             ;
+
+ERRORS=$((ERRORS+$?))
+
+pip2 install pygost
+
+ERRORS=$((ERRORS+$?))
+
+echo
+if [ $ERRORS -eq 0 ]; then
+  echo '[  OK  ] All commands were successful'
+  exit 0
+else
+  echo '[ FAIL ] Some commands were not successful'
+  exit 1
+fi