delete returns NOT_FOUND as of 1.6.40

[remicollet]

See #161

With memcached 1.6.40

$ src/bin/memcapable  -a -h localhost -p  11211
ascii version                           [pass]
ascii quit                              [pass]
ascii verbosity                         [pass]
ascii set                               [pass]
ascii set noreply                       [pass]
ascii get                               [pass]
ascii gets                              [pass]
ascii mget                              [pass]
ascii flush                             [pass]
ascii flush noreply                     [pass]
ascii add                               [pass]
ascii add noreply                       [pass]
ascii replace                           [pass]
ascii replace noreply                   [pass]
ascii cas                               [pass]
ascii cas noreply                       [pass]
ascii delete                            [pass]
ascii delete noreply                    [pass]
ascii incr                              [pass]
ascii incr noreply                      [pass]
ascii decr                              [pass]
ascii decr noreply                      [pass]
ascii append                            [pass]
ascii append noreply                    [pass]
ascii prepend                           [pass]
ascii prepend noreply                   [pass]
ascii stat                              [pass]
All tests passed

I add "NOT_FOUND" as a possible value for error

Other way is to expect a "NOT_FOUND" response, but this will make the test incompatible with older versions

[m6w6]

Awesome! Thank you, Remi. Was wondering why it was failing on my sr.ht BSD builds lately.

[m6w6]

Had to rebase it, since your commit was not signed; merged as 664fada

[remicollet]

Had to rebase it, since your commit was not signed; merged as 664fada

Thanks