Whitelist all perms on installExistingPackage

The code allows to also whitelist only a select set of permissions, but
this is not yet exposed in the API.

Also: Fix up shell commands for restricted permissions

Fixes: 132368462
Test: - Enabled app via device admin in secondary profile
        -> verified that permissions were whitelisted
      - Installed existing and new app using --restrictpermissions and
        not
	-> verified that permissions were whitelisted or not
      atest AppRestrictionsHelperTest
            RestrictedPermissionsTest
Change-Id: I9cd76c555b40663f2e25ad86e8a54991baae346c
Merged-In: I9787e63d8beb8f6b1ba2d15532d4c0f69dbdf863