fix #411: Apply compression predicate before sendFile invocation

[violetagg]

Compression predicate has to be applied before sendFile invocation
because when there is a compression in place, send file with zero copy
cannot be used.

[codecov-io]

Codecov Report

Merging #415 into 0.7.x will increase coverage by 0.29%.
The diff coverage is 100%.

@@             Coverage Diff              @@
##              0.7.x     #415      +/-   ##
============================================
+ Coverage     69.08%   69.38%   +0.29%     
- Complexity     1049     1057       +8     
============================================
  Files            72       72              
  Lines          4419     4422       +3     
  Branches        639      639              
============================================
+ Hits           3053     3068      +15     
+ Misses          977      972       -5     
+ Partials        389      382       -7

Impacted Files	Coverage Δ	Complexity Δ
...in/java/reactor/ipc/netty/http/HttpOperations.java	68.83% <ø> (ø)	22 <0> (ø)	⬇️
...or/ipc/netty/http/server/HttpServerOperations.java	68.75% <100%> (+1.55%)	58 <3> (+5)	⬆️
.../ipc/netty/http/server/HttpServerWSOperations.java	63.15% <0%> (-3.51%)	14% <0%> (-1%)
...or/ipc/netty/channel/ChannelOperationsHandler.java	66.22% <0%> (+0.21%)	61% <0%> (+1%)	⬆️
...or/ipc/netty/http/client/HttpClientOperations.java	57.59% <0%> (+0.78%)	80% <0%> (+1%)	⬆️
.../ipc/netty/channel/PooledClientContextHandler.java	64.7% <0%> (+0.84%)	26% <0%> (ø)	⬇️
...a/reactor/ipc/netty/channel/ChannelOperations.java	83.46% <0%> (+1.57%)	48% <0%> (+1%)	⬆️
src/main/java/reactor/ipc/netty/FutureMono.java	69.16% <0%> (+1.66%)	8% <0%> (ø)	⬇️
...java/reactor/ipc/netty/channel/ContextHandler.java	75.72% <0%> (+2.91%)	27% <0%> (+1%)	⬆️

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