WASHINGTON — Seven “Real Housewives” took on Washington on Wednesday — and somehow managed to bring the least amount of drama to Capitol Hill. While Sen. Rand Paul (R-Ky.) and Homeland Security Secretary-designate Markwayne Mullin (R-Okla.) dueled in a hearing room and Director of National Intelligence Tulsi Gabbard defended her tenure , the Bravo stalwarts were promoting a common cause — expanding funding for HIV research and treatment.  “Everybody’s been very kind. Honestly, we’ve had a great