feat(CI): improve Travis configuration (#1486)

- use random DB names in order to detect statements which address a specific DB
- split compilation and DB check (DB check and dry run only have to run once)
- use separate shell scripts for easier module Travis integration

apps/ci/ci-error-check.sh

@@ -0,0 +1,18 @@
+#!/usr/bin/env bash
+
+DB_ERRORS_FILE="/home/travis/build/azerothcore/azerothcore-wotlk/env/dist/bin/DBErrors.log";
+#DB_ERRORS_FILE="./env/dist/bin/DBErrors.log";
+
+if [[ ! -f ${DB_ERRORS_FILE} ]]; then
+    echo "File ${DB_ERRORS_FILE} not found!";
+    exit 1
+fi
+
+if [[ -s ${DB_ERRORS_FILE} ]]; then
+     printf "The DBErrors.log file contains startup errors:\n\n";
+     cat ${DB_ERRORS_FILE};
+     printf "\nPlease solve the startup errors listed above!\n";
+     exit 1;
+else
+     echo "No startup errors found in DBErrors.log, good job!";
+fi