Stop expecting the deprecation message in test.

[cprov]

Out of the blue we started getting this weird error in the 'Pre-merging' tests:

https://travis-ci.org/snapcore/snapcraft/builds/412858741

The proposed fix stop matching a chunk of opaque data before the revisions table. I suspect it was there for coping with the 'deprecation' message when the history command is used, but I can't tell for sure if anything related changed in snapcraft.

[codecov-io]

Codecov Report

Merging #2195 into master will decrease coverage by <.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #2195      +/-   ##
==========================================
- Coverage   91.22%   91.21%   -0.01%     
==========================================
  Files         201      201              
  Lines       12909    12909              
  Branches     1913     1913              
==========================================
- Hits        11776    11775       -1     
  Misses        770      770              
- Partials      363      364       +1

Impacted Files	Coverage Δ
snapcraft/internal/elf.py	82.84% <0%> (-0.33%)	⬇️

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[sergiusens]

sorry about this

[cprov]

@sergiusens thanks for clarifying that it was not about the deprecation message (which does not affect the command in question, revisions is not deprecated). The opaque chunk of text was for the debug messages that are not disabled.