Rename .mysql_history to .mariadb_history

The binaries have been renamed, but the history file still maintains the old name, and should be renamed to match.

This change should be done in a manner that has the least impact for the end users during upgrade.

Suggested fix:

• When 'mariadb' is starting check if '~/.mariadb_history' exists
• If yes, use it
• If not, check if ~/.mysql_history' exists
• If yes, use it
• If not, create ~/.mariadb_history and use it