HttpsURLConnectionTest rewrite and URLConnectionTest updates

Rewrote HttpsURLConnectionTest to work with current SSLSocket
implementation which more strictly follows RI behavior.

Also made upates to URLConnectionTest related to HttpsURLConnection
- changed assertContent call connect() explictly to illustrate problem
  with https proxy case also seen by HttpsURLConnectionTest
- Rewrote testConnectTimeouts to work reliably. Before if often
  worked on WiFi but not on mobile networks where a "HTTP/1.1 501 Bad
  Gateway" would be seen causing a FileNotFoundException.
- Changed testConnectViaHttpProxyToHttpsUsingHttpProxySystemProperty
  to match expectation that https does not use the http.proxyHost
  values. Added new testConnectViaHttpProxyToHttpsUsingProxyArgWithNoProxy
  which should have the same behavior as the fixed
  testConnectViaHttpProxyToHttpsUsingHttpProxySystemProperty

Change-Id: I397f55905524e2bbb587533f258ef0418ca8af80