Regenerate certificate on each installation.

[Matthiman]

Hello, I use the dev-branch version and for about 10 days when I launch the installer each time in the middle of the installation there is this message and my client workstations are no longer authenticated…

This run will mint a new FOG PKI CA. A CA's name constraints are
  fixed at the moment it's issued -- widening them later means
  re-issuing it (rm -rf the CA directory, then re-run).
  Extra hostnames for this server, space-separated (3 min, blank = none):
  Internal domains, space-separated, e.g. example.local (3 min, blank = none):

[Matthiman]

And I can’t add any hosts—whether via the web interface or by booting over the network—; ultimately, the new host doesn’t appear in the database…

Failed to query: Error: SQLSTATE[22007]: Invalid datetime format: 1366 Incorrect integer value: '' for column `fog`.`moduleStatusByHost`.`msHostID` at row 1 Error Message: Error Code: "22007", Error Message: ["22007",1366,"Incorrect integer value: '' for column `fog`.`moduleStatusByHost`.`msHostID` at row 1"], Debug: SQL: [629] INSERT INTO `moduleStatusByHost` (`msHostID`,`msModuleID`,`msState`) VALUES (:hostID_0,:moduleID_0,:state_0),(:hostID_1,:moduleID_1,:state_1),(:hostID_2,:moduleID_2,:state_2),(:hostID_3,:moduleID_3,:state_3),(:hostID_4,:moduleID_4,:state_4),(:hostID_5,:moduleID_5,:state_5),(:hostID_6,:moduleID_6,:state_6),(:hostID_7,:moduleID_7,:state_7),(:hostID_8,:moduleID_8,:state_8),(:hostID_9,:moduleID_9,:state_9),(:hostID_10,:moduleID_10,:state_10),(:hostID_11,:moduleID_11,:state_11),(:hostID_12,:moduleID_12,:state_12) ON DUPLICATE KEY UPDATE `msHostID`=VALUES(`msHostID`),`msModuleID`=VALUES(`msModuleID`),`msState`=VALUES(`msState`)