LNT's MANIFEST.in file is missing required client & server requirement files

[PrzemekWirkus]

Summary

This patch updates LNT's MANIFEST.in file with two missing entries which are required to correctly specify the files needed to distribute LNT as redistributable Python source distribution.
If we don’t supply an explicit list of files, packaging command puts a minimal default set of files into the source distribution (omitting requirements.client.txt & requirements.server.txt). Both .txt files store pinned versions of dependencies for LNT client and server.

Missing MANIFEST.in file entries with requirements are:

• requirements.client.txt
• requirements.server.txt

[cmatthews]

LGTM.

MANIFEST.in

 include README.txt CHANGELOG.txt
+include requirements.client.txt requirements.server.txt
 recursive-include docs *
 recursive-include tests *
 recursive-include examples *
 recursive-include lnt/server/ui/static *.css *.js *.html *.ico *.txt
 recursive-include lnt/server/ui/templates *.html
 recursive-include lnt/server/db/migrations *
 include lnt/server/ui/static/flot/Makefile
 include lnt/external/stats/README.txt
 global-exclude *pyc
 global-exclude *~
 prune docs/_build
 prune tests/*/Output
 prune tests/*/*/Output