Note 1) we're not supposed to be using #!/usr/bin/env python, see
https://fedoraproject.org/wiki/Packaging:Guidelines?rd=Packaging/Guidelines#Shebang_lines

Note 2) we're also not supposed to be using "!/usr/bin/python,
see https://fedoraproject.org/wiki/Changes/Avoid_usr_bin_python_in_RPM_Build#Quick_Opt-Out

The previous patch (https://review.gluster.org/19767) tried to do too
much in one patch, so it was abandoned.

This patch does two things:
1) minor cleanup of configure(.ac) to explicitly use python2
2) change all the shebang lines to #!/usr/bin/python2 and add them
where they were missing based on warnings emitted during rpmbuild.

In a follow-up patch python2 will eventually be changed to python3.

Before that python2-isms (e.g. print, string.join(), etc.) need to be
converted to python3. Some of those can be rewritten in version agnostic
python. E.g. print statements become print() with "from __future_ import
print_function". The python 2to3 utility will be used for some of those.
Also Aravinda has given guidance in the comments to the first patch for
changes.

updates: #411
Change-Id: I471730962b2526022115a1fc33629fb078b74338
Signed-off-by: Kaleb S. KEITHLEY <kkeithle@redhat.com>

Documentation is available in patch:
http://review.gluster.org/#/c/9800/

A tool which helps to get list of modified files or list of all files in
GlusterFS Volume using Changelog or find command.

Usage
=====
glusterfind --help

Create:
-------
glusterfind create --help

The tool creates status file $GLUSTERD_WORKDIR/SESSION/VOLUME/status
and records current timestamp to initiate the session. This timestamp
will be used as start time for next runs.

As part of create also generates ssh key and distributes to all peers.
and enables build.pgfid and changelog using volume set command.

Pre:
----
glusterfind pre --help

This command is used to generate the list of files modified after session
creation time or after last run. To get list of all files/dirs in Volume,
run pre command with `--full` argument.

The tool gets all nodes details using gluster volume info and runs node
agent for each brick in respective nodes via ssh command. Once these node
agents generate the output file, tool copies to local using scp. Merges all
the output files to generate the final output file.

Post:
-----
glusterfind post --help

After consuming the list, this sub command is called to update the session
time based on pre command status file.

List:
-----
glusterfind list --help

To view all the sessions

Delete:
-------
glusterfind delete --help

Delete session.

Known Issues
------------
1. Deleted files will not get listed, since we can't convert GFID to
   Path if file/dir is deleted.
2. Only new name will get listed if Renamed.
3. All hardlinks will get listed.

Change-Id: I82991feb0aea85cb6ec035fddbf80a2b276e86b0
BUG: 1193893
Signed-off-by: Aravinda VK <avishwan@redhat.com>
Reviewed-on: http://review.gluster.org/9682
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Venky Shankar <vshankar@redhat.com>
Reviewed-by: Prashanth Pai <ppai@redhat.com>
Reviewed-by: Kotresh HR <khiremat@redhat.com>
Reviewed-by: Vijay Bellur <vbellur@redhat.com>