Drop redundant bash -xe

By default Jenkins start the shell script with 'bash -xe', so we do not
need to specify a shebang.

Note: using simply 'bash' or 'bash -x', disables -e entirely :(  Will be
fixed in another patchset.

Updates:

*jslint
mediawiki-vagrant-puppet-doc
mwext-VisualEditor-csslint
operations-apache-config-lint
operations-puppet-doc

Change-Id: I1562e284622ed2d88649300bb152d87d50ceea76