Add plugin_rpc_err(), which works something like clixon_err, but it
saves error information from a plugin for reporting rpc-errors that
need to be returned.

Signed-off-by: Corey Minyard <corey@minyard.net>

Signed-off-by: Corey Minyard <corey@minyard.net>

Don't store "candidate" or any other database except "running" on disk,
only keep it in memory, if CLIXON_TMPDB_VOLATILE is true.  This, along
with the stateonly handling, can be used to avoid storing sensitive
data in the clixon databases.

Signed-off-by: Corey Minyard <corey@minyard.net>

Signed-off-by: Corey Minyard <corey@minyard.net>

Signed-off-by: Corey Minyard <corey@minyard.net>

Using a string for a path didn't work, when adding path elements to
the tree using it you need to add a namespace in certain places.  So
take an XML path instead and use the namespaces from that.

Signed-off-by: Corey Minyard <corey@minyard.net>

It can get there from the user or from defaults, but we don't want it.

Also add some documentation on some functions.

Signed-off-by: Corey Minyard <corey@minyard.net>

If passing in an XML tree to the stateonly functions, completely ignore
the database, don't do anything to it.

Signed-off-by: Corey Minyard <corey@minyard.net>

The database must be sorted afer reading in the data from xmldb or other
operations won't work correctly.

Add the stateonly data to the running database during a commit
operation so the compare will work correclty.

Signed-off-by: Corey Minyard <corey@minyard.net>

The data is expected to still be in the candidate database unless it is
discarded, so don't delete it.

Signed-off-by: Corey Minyard <corey@minyard.net>

The candidate commit function need to always clean the candidate
database at the end.

Signed-off-by: Corey Minyard <corey@minyard.net>