8164982: Fix legal notices in java/lang, java/net, java/util tests.
Reviewed-by: darcy, iris

8136930: Simplify use of module-system options by custom launchers
Reviewed-by: alanb, ksrini, henryjen, sundar

8158851: MH.publicLookup() init circularity, triggered by custom SecurityManager with String concat and -limitmods java.base
Reviewed-by: alanb, redestad, jlaskey

8155090: String concatenation fails with a custom SecurityManager that uses concatenation
Reviewed-by: redestad, chegar