pgsql: Use less-generic names in matview.sql.

Use less-generic names in matview.sql.

The original coding of this test used table and view names like "t",
"tv", "foo", etc.  This tended to interfere with doing simple manual
tests in the regression database; not to mention that it posed a
considerable risk of conflict with other regression test scripts.
Prefix these names with "mvtest_" to avoid such conflicts.

Also, change transiently-created role name to be "regress_xxx" per
discussions about being careful with regression-test role creation.

Branch
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master

Details
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http://git.postgresql.org/pg/commitdiff/4447f0bcb66547708fa977d6b252046e792a7e04

Modified Files
--------------
src/test/regress/expected/matview.out | 478 +++++++++++++++++-----------------
src/test/regress/expected/rules.out   |  16 +-
src/test/regress/output/misc.source   |  20 +-
src/test/regress/sql/matview.sql      | 270 +++++++++----------
4 files changed, 392 insertions(+), 392 deletions(-)