Adjust visibility to avoid build breaks.

per b/167962976#comment10,  following project directories are being
moved under platform/packages/modules/Connectivity/...

cts/test/net --> packages/modules/Connectivity/tests/cts/net
cts/tests/tests/tethering -> packages/modules/Connectivity/tests/cts/tethering
cts/hostsidetests/net -> packages/modules/Connectivity/tests/cts/hostside

BUG: 167962976
Test: TH & Local Build
Exempt-From-Owner-Approval: PS.1 +2d by Lorenzo.  fixing tab (+2 not sticky)
Change-Id: I295fcb89842dd4d9f9ad329418b27e9036f093ae