Activate virtualenv in updateucsc.sh.sample

[nsoranzo]

What did you do?

• Activate virtualenv in the cron/updateucsc.sh.sample script

Why did you make this change?

If the virtualenv is not activated, Python 2 is used or requests may be missing, resulting in errors:

$ bash cron/updateucsc.sh.sample
Creating required directories.
cron/../tool-data/shared/ucsc/new already exists, continuing.
cron/../tool-data/shared/ucsc/chrom already exists, continuing.
cron/../tool-data/shared/ucsc/chrom/new already exists, continuing.
Wed  7 Apr 18:12:25 BST 2021
Updating UCSC shared data tables.
Updating builds.txt
Traceback (most recent call last):
  File "cron/../cron/parse_builds.py", line 11, in <module>
    import requests
ImportError: No module named requests
Failed to update builds.txt
Updating ucsc_build_sites.txt
Traceback (most recent call last):
  File "cron/../cron/parse_builds_3_sites.py", line 8, in <module>
    import requests
ImportError: No module named requests
Failed to update builds.txt
Building chromInfo tables.
  File "cron/../cron/build_chrom_db.py", line 78
    print("\t".join(chrominfo), file=outfile)
                                    ^
SyntaxError: invalid syntax
Failed to update chromInfo tables.
Update complete.
Adding Manual Builds.
  File "cron/../cron/add_manual_builds.py", line 36
    print(build + "\t" + name + " (" + build + ")", file=build_file_out)
                                                        ^
SyntaxError: invalid syntax
Manual addition failed

How to test the changes?

(select the most appropriate option; if the latter, provide steps for testing below)

• I've included appropriate automated tests.
• This is a refactoring of components with existing test coverage.
• Instructions for manual testing are as follows:
  1. bash cron/updateucsc.sh.sample

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