RFR(S): 8155950: Add minimal VM in JIB profile on linux-x86

[Leonid Mesnik]

Please review this small change which adds minimal VM as a part of 
default JIB profile on linux-x86. The fix also include quick workaround 
for bug JDK-8155946 <https://bugs.openjdk.java.net/browse/JDK-8155946>.

Bug: https://bugs.openjdk.java.net/browse/JDK-8155950
Webrev (top): 
http://cr.openjdk.java.net/~lmesnik/8155950/webrev.00/root/ 
<http://cr.openjdk.java.net/%7Elmesnik/8155950/webrev.00/root/>
Webrev(hotspot): 
http://cr.openjdk.java.net/~lmesnik/8155950/webrev.00/hotspot/ 
<http://cr.openjdk.java.net/%7Elmesnik/8155950/webrev.00/hotspot/>

Testing: JPRT (with updated testing of minimal VM flags)

Leonid
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