Just a coincidence.
I actually do think it is more coincidental than anything else, but if the trend continues, questions may be asked. The Astros are only one ahead of four other teams in getting hit in spring training. As of right now, the HBP stats are:
7 - Houston
6 - Cincinnati, Detroit, Philadelphia, St. Louis
4 - San Diego
The other teams have 3 or fewer at this point.
EDIT TO ADD: Only two of the 7 Astros (Altuve and Bregmann) were on the 2017 team. The others were minor leaguers or on other teams.