Tests only run in simulation mode

When trying to run the tests with SGX_MODE=HW, 3 tests fail with the following error message:

[info]   Cause: java.lang.NoClassDefFoundError: Could not initialize class edu.berkeley.cs.rise.opaque.execution.SGXEnclave$
[info]   at edu.berkeley.cs.rise.opaque.execution.SGXEnclave.<init>(SGXEnclave.scala:22)
[info]   at edu.berkeley.cs.rise.opaque.Utils$.initEnclave(Utils.scala:236)
[info]   at edu.berkeley.cs.rise.opaque.RA$$anonfun$initRA$1$$anonfun$2.apply(RA.scala:39)
[info]   at edu.berkeley.cs.rise.opaque.RA$$anonfun$initRA$1$$anonfun$2.apply(RA.scala:38)
[info]   at org.apache.spark.rdd.RDD$$anonfun$mapPartitions$1$$anonfun$apply$23.apply(RDD.scala:801)
[info]   at org.apache.spark.rdd.RDD$$anonfun$mapPartitions$1$$anonfun$apply$23.apply(RDD.scala:801)
[info]   at org.apache.spark.rdd.MapPartitionsRDD.compute(MapPartitionsRDD.scala:52)
[info]   at org.apache.spark.rdd.RDD.computeOrReadCheckpoint(RDD.scala:324)
[info]   at org.apache.spark.rdd.RDD.iterator(RDD.scala:288)
[info]   at org.apache.spark.scheduler.ResultTask.runTask(ResultTask.scala:90)

Failing tests are:

[error]         edu.berkeley.cs.rise.opaque.QEDSuite
[error]         edu.berkeley.cs.rise.opaque.OpaqueSinglePartitionSuite
[error]         edu.berkeley.cs.rise.opaque.OpaqueMultiplePartitionSuite

Reproduce the failures with SGX_MODE=HW, then inspect SGXEnclave.scala:22 and Utils.scala:236 in the stack trace. Use QEDSuite, OpaqueSinglePartitionSuite, and OpaqueMultiplePartitionSuite as the regression scope; done means all three pass in hardware mode.