Rename unique constraints due to new convention.

We have found that current constraint name convention allows us to create
constraints with duplicate names. It happens if we add constraints
in different tables with the same column names (for example, `name`,
`deleted`). In this case we can not create new constraint in mysql due to
database limitation (it requires constraint name to be unique within a
database). To solve this issue unique constraint name convention has
been changed from "uniq_c1_x_c2_x_c3" to "uniq_t0c10c20c3" where `t` is
a table name and columns `c1`, `c2`, `c3` are in UniqueConstraint.
Fixed unique constraints in models description.
Synced db code from oslo (function `_raise_if_duplicate_entry_error()`
modified respectively to new unique constraint name convention).

blueprint db-enforce-unique-keys
Fixes: bug 1182054

Change-Id: I4122dfb910a07a1a423781ebc22e9ce50596a05d

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