test: move slow tests to test/pummel/

Slowness being somewhat subjective but determined by running the
test suite a few times and picking off everything that consistently
clocks in at 2 seconds or more.

Honorable mention for simple/test-tls-server-large-request, it often
runs for 10 (!) seconds or more.

diff --git a/test/simple/test-debug-break-on-uncaught.js b/test/pummel/test-debug-break-on-uncaught.js
similarity index 100%
rename from test/simple/test-debug-break-on-uncaught.js
rename to test/pummel/test-debug-break-on-uncaught.js

diff --git a/test/simple/test-debugger-repl-break-in-module.js b/test/pummel/test-debugger-repl-break-in-module.js
similarity index 100%
rename from test/simple/test-debugger-repl-break-in-module.js
rename to test/pummel/test-debugger-repl-break-in-module.js

diff --git a/test/simple/test-https-no-reader.js b/test/pummel/test-https-no-reader.js
similarity index 100%
rename from test/simple/test-https-no-reader.js
rename to test/pummel/test-https-no-reader.js

diff --git a/test/simple/test-stream-pipe-multi.js b/test/pummel/test-stream-pipe-multi.js
similarity index 100%
rename from test/simple/test-stream-pipe-multi.js
rename to test/pummel/test-stream-pipe-multi.js

diff --git a/test/simple/test-stream2-basic.js b/test/pummel/test-stream2-basic.js
similarity index 100%
rename from test/simple/test-stream2-basic.js
rename to test/pummel/test-stream2-basic.js

diff --git a/test/simple/test-tls-securepair-client.js b/test/pummel/test-tls-securepair-client.js
similarity index 100%
rename from test/simple/test-tls-securepair-client.js
rename to test/pummel/test-tls-securepair-client.js

diff --git a/test/simple/test-tls-server-large-request.js b/test/pummel/test-tls-server-large-request.js
similarity index 100%
rename from test/simple/test-tls-server-large-request.js
rename to test/pummel/test-tls-server-large-request.js