add gnvm update args logic
add gnvm update logic
optimize gnvm update
modify gnvm update latest -g logic
Fixbug of gnvm install x.xx.xx -g logic use 'fallthrough' error
Fixbug of gnvm install more one parameter logic
Fixbug of gnvm update same logic error and copywritting.
Fixbug of when no install success not reset config file
optimize gnvm update logic
Fixbug of when no newwork gnvm update panic not defer function.
Merge branch 'feature/gnvm-update-module' into develop