ShellPermissionsTest: Test NETWORK_STACK is not held by Shell

NETWORK_STACK permission should not be held by
Shell since it allows access to too many
privileged APIs. Add it to CTS
ShellPermissionTest to prevent granting this
permission to Shell accidentally.

Bug: 151092232
Test: atest ShellPermissionTest
Change-Id: I129f4c22cd02a034232c960fb72ce7c7ae406b06
1 file changed