lalapps: update configparser imports for python3

this doesn't use `six` because I think Kipp would prefer it didn't
31 jobs for lalapps-configparser in 105 minutes and 11 seconds (queued for 5 seconds)
Status Job ID Name Coverage
  .Pre
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make-dist

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  Lal
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lal:conda:fftw

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lal:conda:mkl

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lal:deb

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lal:rpm

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  Lal Frame
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lalframe:conda

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lalframe:deb

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lalframe:rpm

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  Lal Meta Io
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lalmetaio:conda

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lalmetaio:deb

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lalmetaio:rpm

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  Lal Simulation
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lalsimulation:conda

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lalsimulation:deb

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lalsimulation:rpm

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  Lal Burst
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lalburst:conda

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lalburst:deb

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lalburst:rpm

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  Lal Inspiral
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lalinspiral:conda

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lalinspiral:deb

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lalinspiral:rpm

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  Lal Pulsar
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lalpulsar:conda

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lalpulsar:deb

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lalpulsar:rpm

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  Lal Inference
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lalinference:conda

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lalinference:deb

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lalinference:rpm

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  Lal Apps
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lalapps:conda

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lalapps:deb

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lalapps:rpm

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  Documentation
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documentation

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  Integration Tests
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top-level

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