adding generated-by-agent header to generated resolv.conf

Signed-off-by: Maria Shaldibina <mariash@pivotallabs.com>
use proper logger level in action dispatcher

Signed-off-by: dmitriy kalinin <dmitriy@pivotallabs.com>
expose exit status to CmdRunner interface

Signed-off-by: dmitriy kalinin <dmitriy@pivotallabs.com>
reorganize action factory

Signed-off-by: dmitriy kalinin <dmitriy@pivotallabs.com>
implement run_errand message on go agent

Signed-off-by: dmitriy kalinin <dmitriy@pivotallabs.com>
make all cli_errand integration tests consistent

Signed-off-by: dmitriy kalinin <dmitriy@pivotallabs.com>