Added tests for removing files from package.

jps-plugin/testData/incremental/packageFileChangedPackage/a.kt

@@ -0,0 +1,3 @@
+package test
+
+fun a() = "a"

jps-plugin/testData/incremental/packageFileChangedPackage/b.kt

@@ -0,0 +1,3 @@
+package test
+
+fun b() = "b"

jps-plugin/testData/incremental/packageFileChangedPackage/b.kt.new

@@ -0,0 +1,3 @@
+package newName
+
+fun b() = "b"

jps-plugin/testData/incremental/packageFileChangedPackage/build.log

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+Cleaning output files:
+out/production/module/test/TestPackage-b-*.class
+out/production/module/test/TestPackage.class
+End of files
+Compiling files:
+src/b.kt
+End of files
+Cleaning output files:
+out/production/module/test/TestPackage-a-*.class
+out/production/module/test/TestPackage.class
+End of files
+Compiling files:
+src/a.kt
+End of files