[#1843] Remove much of the E from E-iRODS, now known as iRODS

Leaving the locations that refer to URLs, since cannot or will not
be changed quite yet.

Other changes, in the actual code, coming soon...

Signed-off-by: Zoey Greer <tempoz@renci.org>
[#1843] Renamed files with less e
[#1843] lots less e in src