Fix a problem adding MSIDs to existing content type

[taldcroft]

Description

When adding MSIDs to a cheta local archive where the content type already exists, it does not update the colname.pkl file, thus leaving the new MSIDs invisible to fetch.

Testing

• Passes unit tests on MacOS
• Functional testing

Functional testing

Ran this on my Mac on an up-to-date local archive and confirmed:

• The colnames.pkl files were still copied even though they exist
• New debug logging appears

(ska3) ➜  eng_archive git:(fix-add-msids) python -m cheta.update_client_archive --add-msids=p015.txt --server-data-root=aldcroft@ccosmos.cfa.harvard.edu --dry-run --log-level=1
2021-03-25 06:45:06,948 Running cheta_update_client_archive version 4.52.1.dev1+gaf6a60d
2021-03-25 06:45:06,948   /Users/aldcroft/git/eng_archive/cheta/update_client_archive.py
2021-03-25 06:45:06,948 
2021-03-25 06:45:06,948 Updating client archive at /Users/aldcroft/ska/data/eng_archive
2021-03-25 06:45:06,948 Reading available cheta archive MSIDs from https://icxc.cfa.harvard.edu/aspect/cheta/
2021-03-25 06:45:07,052 Reading cheta MSIDs list file https://icxc.cfa.harvard.edu/aspect/cheta/sync/msid_contents.pkl.gz
2021-03-25 06:45:07,055 Reading MSID specs from p015.txt
2021-03-25 06:45:07,055 Assembling list of MSIDs that match MSID specs
2021-03-25 06:45:07,061   Found 1 MSIDs for 1AHITMPF
2021-03-25 06:45:07,067   Found 1 MSIDs for 1OATMF
2021-03-25 06:45:07,073   Found 1 MSIDs for 1OATMST
2021-03-25 06:45:07,073   Found 3 matching MSIDs total
2021-03-25 06:45:07,088 Found 3 local archive files that are missing and need to be copied
2021-03-25 06:45:07,088 Copy_files:
2021-03-25 06:45:07,088 data/acis3eng/colnames.pickle
2021-03-25 06:45:07,088 data/pcad3eng/colnames.pickle
2021-03-25 06:45:07,088 data/pcad8eng/colnames.pickle
2021-03-25 06:45:07,140 Connecting to ccosmos.cfa.harvard.edu
Password for aldcroft@ccosmos.cfa.harvard.edu: 
2021-03-25 06:45:10,955 Copying 3 files from aldcroft@ccosmos.cfa.harvard.edu to /Users/aldcroft/ska/data/eng_archive
2021-03-25 06:45:10,955 DRY RUN
|>-------------------------------------------------------------------------|   0 /  3  ( 0.00%)2021-03-25 06:45:10,956 Local file=/Users/aldcroft/ska/data/eng_archive/data/acis3eng/colnames.pickle
2021-03-25 06:45:10,956 Server file=/proj/sot/ska/data/eng_archive/data/acis3eng/colnames.pickle
2021-03-25 06:45:10,956 copy data/acis3eng/colnames.pickle
2021-03-25 06:45:10,956 Local file=/Users/aldcroft/ska/data/eng_archive/data/pcad3eng/colnames.pickle
2021-03-25 06:45:10,956 Server file=/proj/sot/ska/data/eng_archive/data/pcad3eng/colnames.pickle
2021-03-25 06:45:10,956 copy data/pcad3eng/colnames.pickle
2021-03-25 06:45:10,957 Local file=/Users/aldcroft/ska/data/eng_archive/data/pcad8eng/colnames.pickle
2021-03-25 06:45:10,957 Server file=/proj/sot/ska/data/eng_archive/data/pcad8eng/colnames.pickle
2021-03-25 06:45:10,957 copy data/pcad8eng/colnames.pickle