This patch will fix following issue logs:
2019-09-02 15:11:13.121 | dib-run-parts Running /tmp/in_target.d/install.d/25-trove-mongo-dep
2019-09-02 15:11:13.124 | + pip2 install pymongo
2019-09-02 15:11:13.125 | /tmp/in_target.d/install.d/25-trove-mongo-dep: line 9: pip2: command not found
And move on pip3.
Change-Id: I7cf16820091a0f977b41e3222abb866a9ae66166