Moving warning filter to the whole file.

[iparask]

I moved the warning filter to the whole file. It will make sure that the deprecation message will be printed once, regardless how many times a task is created. I am not sure how to create a test other than running something like:

from radical.entk import Task
for _ in range(100):
    t = Task()
    t.cpu_reqs = {'processes': 16, 'process_type': 'MPI', 'threads_per_process': 1, 'thread_type': 'OpenMP'}
for _ in range(100):
    t = Task()
    t.gpu_reqs = {'processes': 16, 'process_type': 'MPI', 'threads_per_process': 1, 'thread_type': 'OpenMP'}

and observing the output.

This fixes #523.

[codecov]

Codecov Report

Merging #525 (79d5d97) into devel (573cb41) will decrease coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##            devel     #525      +/-   ##
==========================================
- Coverage   62.84%   62.82%   -0.02%     
==========================================
  Files          20       20              
  Lines        2387     2386       -1     
==========================================
- Hits         1500     1499       -1     
  Misses        887      887              

Impacted Files	Coverage Δ
src/radical/entk/task.py	80.44% <100.00%> (-0.06%)	⬇️

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[mturilli]

LGTM. Thanks!