GUV. That was what other inmates called former Gov. John G.
Rowland in prison when Brad Davis, a radio broadcaster, went to
visit him last fall. To Mr. Davis, a strong supporter of Mr.
Rowland, it showed the ex-governor's continuing ability to earn
respect and admiration, no matter the audience.  But it is also
undoubtedly a testament to the governor's descent -- a casual
nickname in a prison yard stripped of its powers and its
grandeur. The Guv isn't the governor, and when he is released
from federal prison in Loretto, Pa., scheduled for today, he
returns to Connecticut as just a citizen and an ex-convict.  As
governor, he was entrusted with negotiating a multibillion-
dollar budget and was protected by a bodyguard; now he must get
permission before he can even get a job, and must brace himself
for unannounced visits by a federal probation officer.  ''All
the trappings of power are gone,'' said Cornell Lewis, a
Hartford minister who wrote to Mr. Rowland in prison and
considers him a friend. ''You're standing