Since changes to some services on eavesdrop, for example ptgbot, may
need to take effect fairly quickly, run the playbook hourly rather
than daily. We can't easily trigger on changes merging to the ptgbot
repo in the future when it's in a different Zuul tenant from
system-config.
Change-Id: I90ddc555ded0ac1d3134fd075d816155a475c6d2
918dd0ed91