explicit path to tahoe.cfg in creation message

[tpltnt]

Hi there,

I changed the message of tahoe create-client to be explicit about the location of the configuration file. The old message is:

Node created in '/home/foo/.tahoe'
 Please set [client]introducer.furl= in tahoe.cfg!
 The node cannot connect to a grid without it.
 Please set [node]nickname= in tahoe.cfg

The new message is:

(venv)foo% tahoe create-client                           
Node created in '/home/foo/.tahoe'
 Please set [client]introducer.furl= in '/home/foo/.tahoe/tahoe.cfg'!
 The node cannot connect to a grid without it.
 Please set [node]nickname= in '/home/foo/.tahoe/tahoe.cfg'

This should speed up locating the tahoe.cfg file for newcomers.

Cheers,
tpltnt

[codecov-io]

Codecov Report

Merging #412 into master will decrease coverage by 0.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #412      +/-   ##
==========================================
- Coverage   88.02%   88.01%   -0.02%     
==========================================
  Files         146      146              
  Lines       27577    27577              
  Branches     3921     3921              
==========================================
- Hits        24276    24272       -4     
- Misses       2594     2600       +6     
+ Partials      707      705       -2

Impacted Files	Coverage Δ
src/allmydata/scripts/create_node.py	98.4% <100%> (ø)	⬆️
src/allmydata/util/dictutil.py	97.19% <0%> (-0.71%)	⬇️
src/allmydata/mutable/servermap.py	93.71% <0%> (-0.33%)	⬇️
src/allmydata/web/status.py	83.27% <0%> (-0.12%)	⬇️
src/allmydata/windows/inotify.py	0% <0%> (ø)	⬆️
src/allmydata/util/encodingutil.py	87.95% <0%> (ø)	⬆️
src/allmydata/windows/fixups.py	0% <0%> (ø)	⬆️
src/allmydata/immutable/checker.py	88.46% <0%> (+0.51%)	⬆️

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[warner]

Looks good.. I've added a cleanup patch (run quote_local_unicode_path() on the whole path to tahoe.cfg, rather than running it on just the directory and then stripping just one of the quotes to make things line up). Will land momentarily. Thanks!