8144677: jprt.properties should allow creating a user specified testset with custom build flavors and build targets

Made setting jprt.build.flavors and jprt.build.targets more flexible

Reviewed-by: dholmes, mikael
diff --git a/make/jprt.properties b/make/jprt.properties
index d7f3eed..0f828b5 100644
--- a/make/jprt.properties
+++ b/make/jprt.properties
@@ -69,9 +69,20 @@
 jprt.productOpen.build.configure.args=${jprt.product.build.configure.args} --enable-openjdk-only
 jprt.optimizedOpen.build.configure.args=${jprt.product.build.configure.args} --enable-openjdk-only
 
-# Select build flavors and build targets
-jprt.build.flavors=${my.is.hotspot.job ? ${my.build.flavors.hotspot} : ${my.build.flavors.default}}
-jprt.build.targets=${my.is.hotspot.job ? ${my.build.targets.hotspot} : ${my.build.targets.default}}
+
+# hotspot testset has custom build flavors and build targets
+my.jprt.testsetHasCustomBuildFlavors.hotspot=true
+my.jprt.testsetHasCustomBuildTargets.hotspot=true
+
+# determine if the specified testset has custom build flavors or build targets
+my.jprt.testsetHasCustomBuildFlavors=${my.jprt.testsetHasCustomBuildFlavors.${jprt.test.set}}
+my.jprt.testsetHasCustomBuildTargets=${my.jprt.testsetHasCustomBuildTargets.${jprt.test.set}}
+
+# Select build flavors and build targets based on the specified testset
+jprt.build.flavors=${my.jprt.testsetHasCustomBuildFlavors ? \
+    ${my.build.flavors.${jprt.test.set}} : ${my.build.flavors.default}}
+jprt.build.targets=${my.jprt.testsetHasCustomBuildTargets ? \
+    ${my.build.targets.${jprt.test.set}} : ${my.build.targets.default}}
 
 # Select test targets - jprt default for jprt.test.set is "default"
 jprt.test.targets=${my.test.targets.${jprt.test.set}}