Minor changes in the fluent-bit installation script.

installation/fluentbit-install.sh

 apt-get -y install cmake flex bison build-essential
-rm -rf fluent-bit
-git clone https://github.com/fluent/fluent-bit.git
+if [ ! -d fluent-bit ]; then
+  git clone https://github.com/fluent/fluent-bit.git
+fi
 cd fluent-bit
 git checkout -b v1.7.4 tags/v1.7.4
 cd build
@@ -13,5 +14,5 @@ BINARY="$(pwd)/bin/fluent-bit"
 strip --strip-all "$BINARY"
 objdump -T "$BINARY" || true
 cd ../../
-ln -sf "$BINARY" dracut.module/90metadata-collect/fluent-bit || true
+#ln -sf "$BINARY" dracut.module/90metadata-collect/fluent-bit || true