Travis-CI: Ensure AWS key management plugin is not built nor packaged

Building this plugin which requires run-time access to network, uses a lot
of disk space and is slow was already partially disabled. This way we
also ensure that on cmake level it never runs even if it out of some
autodetection reason at times thought it could run.

This fixes the error message:
  fatal: unable to access 'https://github.com/awslabs/aws-sdk-cpp.git/':
  Problem with the SSL CA cert (path? access rights?)

debian/autobake-deb.sh

@@ -129,6 +129,8 @@ Description: Amazon Web Service Key Management Service Plugin for MariaDB
  Services Key Management Service for managing encryption keys used for MariaDB
  data-at-rest encryption.
 EOF
+
+  sed -i -e "/-DPLUGIN_AWS_KEY_MANAGEMENT=NO/d" debian/rules
 fi
 
 # Mroonga, TokuDB never built on Travis CI anyway, see build flags above

debian/rules

@@ -88,6 +88,7 @@ endif
 	    -DINSTALL_LIBDIR=lib/$(DEB_HOST_MULTIARCH) \
 	    -DINSTALL_PLUGINDIR=lib/mysql/plugin \
 	    -DINSTALL_MYSQLTESTDIR=share/mysql/mysql-test \
+	    -DPLUGIN_AWS_KEY_MANAGEMENT=NO \
 	    -DDEB=$(DEB_VENDOR) ..'
 
 # This is needed, otherwise 'make test' will run before binaries have been built