tpm_manager: Unify logging location

This CL defaults tpm_manager daemon logging to syslog.
Logs can be forwarded to stderr by passing the --log_to_stderr switch.
tpm_manager_client now logs to stderr by default.

Bug: 25567627
TEST=Compile and run on DUT

Change-Id: Icd72aa309207eb5dac884bf1ce57209d69288d1d
2 files changed