fix dependency-management/cache-classifers test

used user cache, which made it flaky

sbt/src/sbt-test/dependency-management/cache-classifiers/b/build.sbt

@@ -1,4 +1,7 @@
-libraryDependencies += "org.example" %% "artifacta" % "1.0.0-SNAPSHOT" withSources() classifier("tests") classifier("")
+libraryDependencies += "org.example" %% "artifacta" % "1.0.0-SNAPSHOT" withSources() classifier("tests")
 
-externalResolvers := Seq( "demo" at ( (baseDirectory in ThisBuild).value / "demo-repo").toURI.toString )
+externalResolvers := Seq(
+	"demo" at ( (baseDirectory in ThisBuild).value / "demo-repo").toURI.toString,
+	DefaultMavenRepository
+)
 

sbt/src/sbt-test/dependency-management/cache-classifiers/multi.sbt

@@ -1,3 +1,6 @@
-val b = project
+def localCache = 
+	ivyPaths := new IvyPaths(baseDirectory.value, Some((baseDirectory in ThisBuild).value / "ivy" / "cache"))
 
-val a = project
+val b = project.settings(localCache)
+
+val a = project.settings(localCache)

sbt/src/sbt-test/dependency-management/cache-classifiers/test

@@ -1,7 +1,6 @@
 > a/publish
 
 $ copy-file changes/B.scala b/B.scala
-> b/update
 -> b/test:compile
 
 # Need to sleep 3s because the check depends on last modified time and typical resolution is 1s.
@@ -10,6 +9,4 @@ $ sleep 3000
 $ copy-file changes/A.scala a/src/test/scala/A.scala
 > a/publish
 
--> b/test:compile
-> b/update
 > b/test:compile