Several fixes for backupninja

	- Make 'fs_excludes' parameter optional in client state
	- Make 'fs_includes' parameter optional in server state
	- Clean /etc/backup.d/ dir during every BN client run
	  This is required to make sure there no duplicated custom
	  steps (this can be disabled)

Related: PROD-32863
Related: PROD-32739

Change-Id: I045ef21eee04a2517efb74bcd0600af639907541
(cherry picked from commit a0a547352a0d48eee2b3fad6b4605e83c0ef5148)
4 files changed