Add OSD secret before monitor starts

Add OSD secret before monitor starts

Commit e1f084 introduced a regression when the bootstrap OSD secret is
stored in encrypted databags (EDB). The problem is that if the first
monitor is started without the bootstrap OSD key in the keyring, a
random OSD secret is generated, which will then not match the
pre-generated one.

The solution is to revert the resource that adds the bootstrap OSD key
to where it was (before monitor starts) but add a condition that ensures
this is only done if EDBs are enabled. When EDBs are not enabled, it is
not necessary to add the bootstrap OSD key to the keyring.