* Prevent deadlock in indexer initialisation during graceful restart
* Move from gracehttp to our own service to add graceful ssh
* Add timeout for start of indexers and make hammer time configurable
* Fix issue with re-initialization in indexer during tests
* move the code to detect use of closed to graceful
* Handle logs gracefully - add a pid suffix just before restart
* Move to using a cond and a holder for indexers
* use time.Since
* Add some comments and attribution
* update modules.txt
* Use zero to disable timeout
* Move RestartProcess to its own file
* Add cleanup routine
* Restrict repository indexing by file extension
* Use REPO_EXTENSIONS_LIST_INCLUDE instead of REPO_EXTENSIONS_LIST_EXCLUDE and have a more flexible extension pattern
* Corrected to pass lint gosimple
* Add wildcard support to REPO_INDEXER_EXTENSIONS
* This reverts commit 72a650c8e4.
* Add wildcard support to REPO_INDEXER_EXTENSIONS (no make vendor)
* Simplify isIndexable() for better clarity
* Add gobwas/glob to vendors
* manually set appengine new release
* Implement better REPO_INDEXER_INCLUDE and REPO_INDEXER_EXCLUDE
* Add unit and integration tests
* Update app.ini.sample and reword config-cheat-sheet
* Add doc page and correct app.ini.sample
* Some polish on the doc
* Simplify code as suggested by @lafriks
