fix test_ugprade test, who put the && instead of & all over the place...
fix test_ugprade test, who put the && instead of & all over the place...

maru/libmicrohttpd-http2,maru/libmicrohttpd-http2,ghaderer/libmicrohttpd,ghaderer/libmicrohttpd,maru/libmicrohttpd-http2,ghaderer/libmicrohttpd