vty: derive node name from prompt, use as XML ids

The 'show online-help' produces XML output with <node id="..."> ids.  We
reference those from the osmo-gsm-manuals.

Instead of numeric IDs coming from internal code, rather use a human-readable
node ID -- referencing id='config-msc' is much easier than referencing id='23'.

Add a char name[] to struct cmd_node, to hold this name. This may be provided
upon struct definition.

Since callers of the VTY API so far don't have a name yet, we would need to add
names everywhere to get meaningful node IDs. There is a way to get node ID
names without touching dependent code:

My first idea was to find out which command entered the node, i.e. command
'msc' enters the MSC_NODE. But it is impossible to derive which command entered
which node from data structs, it's hidden in the vty command definition.

But in fact all (TM) known API callers indeed provide a prompt string that
contains a logical and human readable string name. Thus, if the name is unset
in the struct, parse the prompt string and strip all "weird" characters to
obtain a node name from that. We can still set names later on, but for now will
have meaningful node IDs (e.g. 'config-msc' from '%s(config-msc)# ') without
touching any dependent code.

When VTY nodes get identical node names, which is quite possible, the XML
export de-dups these by appending _2, _3,... suffixes. The first occurence is
called e.g. 'name', the second 'name_2', then 'name_3', and so forth.

If a node has no name (even after parsing the prompt), it will be named merely
by the suffix. The first empty node will become id='_1', then '_2', '_3', and
so forth. This happens for nodes like VIEW_NODE or AUTH_NODE.

If this is merged, we need to adjust the references in osmo-gsm-manuals.git.
This can happen in our own time though, because we manually create the vty
reference xml and copy it to the osmo-gsm-manuals.git and then update the
references from the vty_additions.xml. This anyway has to happen because
currently the references tend to be hopelessly out of sync anyway, placing
comments at wildly unrelated VTY commands.

Change-Id: I8fa555570268b231c5e01727c661da92fad265de

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