for pegasus-tc-converter to convert to yam tc container mount points might have variable names listed. for the conversion purposes we don't expand variable names and currently regex fails

1. mount point in the container
   mount "/lizard/scratch-90-days/${TEST_NAME}:/existing/data"

Unable to find a $JAVA_HOME at "/usr", continuing with system-provided Java...
2020.05.01 12:19:46.557 PDT: [FATAL ERROR]
[1]: Unable to instantiate Transformation Catalog at edu.isi.pegasus.planner.catalog.transformation.TransformationFactory.loadInstance(TransformationFactory.java:164)
[2]: edu.isi.pegasus.planner.catalog.transformation.impl.Text caught edu.isi.pegasus.planner.parser.ScannerException line 94: at edu.isi.pegasus.planner.parser.TransformationCatalogTextParser.parse(TransformationCatalogTextParser.java:219)
[3]: Unable to parse mount /lizard/scratch-90-days/${TEST_NAME}:/existing/data at edu.isi.pegasus.planner.catalog.transformation.classes.Container$MountPoint.parse(Container.java:593)