Refactor query options in mysql2 adapter
Refactor query options in mysql2 adapter

For static options used for all queries, set the options via
conn.query_options during connection.  For dynamic options,
set them in the call to conn.query.  No longer provide any
options to result.each.

nju520/sequel,seeARMS/sequel,nicohvi/sequel,offshore-safety/sequel,uhoh-itsmaciek/sequel,uhoh-itsmaciek/sequel,nju520/sequel,nicohvi/sequel,dennis-d/custom_sequel,mpalmer/sequel,Marketcircle/sequel,beni55/sequel,davidbegin/sequel,t-morgan/sequel,yazshel/sequel,chef/sequel,dennis-d/custom_sequel,reubano/sequel,seeARMS/sequel,davidbegin/sequel,pfarrell/sequel,freshpay/sequel,reubano/sequel,yazshel/sequel,gferguson-gd/sequel,knut2/sequel,gferguson-gd/sequel,mpalmer/sequel,offshore-safety/sequel,freshpay/sequel,bigfix/sequel,t-morgan/sequel,knut2/sequel,beni55/sequel,offshore-safety/sequel,pfarrell/sequel