Instead of using recursive search in test directories to find
ConnectivityTestPreparer.apk, only search for it in the dependencies of
net-tests-utils-host-common.
The default strategy for finding test files is to do a recursive search
in test directories, which may find wrong files in wrong directories.
In particular, if some MTS test includes the checker APK, and that test
is linked to a module that boards the train at a version different from
this target preparer, there could be a version difference between the
APK and the host-side preparer.
Follow-up changes will remove ConnectivityTestPreparer.apk from the
dependencies of each test case so it does not appear multiple times in
test suites like android-mts.zip, but this change makes the process
more deterministic.
Test: mts-tradefed run mts-dev -m CtsTetheringTest
Bug: 377716515
Change-Id: I3b00ef9a0bd1d29e8734f44413be4ff16879c574
4a79993944