add requirements to the try::file resources

normally a file resource would automatically require the parent directory first,
but try::file doesn't do this so it has errors if /srv/leap/webapp doesn't exist yet:

for example:

   - [web1] err: /Stage[main]/Site_webapp/Try::File[/srv/leap/webapp/public/img]/Exec[restore_/srv/leap/webapp/public/img]/returns: change from notrun to 0 failed: Working directory '/srv/leap/webapp/public' does not exist

that was 'tried' before the vcsrepo was done which would have resolved that
problem. This makes sure that the vcsrepo is done first

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