[8u40] RFR backport 8058919 and 8049071

[David Holmes]

webrevs:

http://cr.openjdk.java.net/~dholmes/8058919-8049071/webrev.hotspot/
http://cr.openjdk.java.net/~dholmes/8058919-8049071/webrev.top/

8058919: Add sanity test for minimal VM in test/Makefile

This is a direct backport from 9:

http://hg.openjdk.java.net/jdk9/hs-rt/hotspot/rev/c602ed4cfca9

---

8049071: Add jtreg jobs to JPRT for hotspot

These are direct backports from 9 on the hotspot side:

http://hg.openjdk.java.net/jdk9/hs-rt/hotspot/rev/a527e4909a92

The top-level jprt.properties file had to be adjusted for the 8u 
platforms vs 9 platforms:

http://hg.openjdk.java.net/jdk9/hs-rt/rev/e291a5c557d1