Make it possible to set/change VRS tags and description via API

Unfortunately, these are the only parameters that can be setup while creating a virtual report suite.

{
"rsid":"vrs_dehans0_newvrs",
"parent_rsid":"sistr2",
"name":"new vrs",
"segment_list": [
"536bfa98e4b06d874b0c927a",
"536bfa99e4b06d874b0c927f"
]
}

However, it would be great to have the possibility to adapt tags and description of a virtual report suite as well.