Are grapple and shove melee weapon attacks?

@JeremyECrawford Are grapple and shove melee weapon attacks? Do they suffer disadvantage when used underwater if you lack a swimming speed?

— Jeremy Soard (@JeremySoard) June 30, 2015

Grappling/shoving isn't a melee weapon attack. Also, that underwater rule affects attack rolls (PH, 195). https://t.co/aHmujB60CU

— Jeremy Crawford (@JeremyECrawford) June 30, 2015