Fixed EZConnect string regex in OracleInstaller class.

Fixed EZConnect string regex in OracleInstaller class.

The Oracle connect string was valid only if it contained alphanumerics,
underscore and dot. Some new schmemes makes uses of slashes and
EZConnect has the concept of server types (pooled, dedicated, shared)
which we now validate.

The long regex is now in OracleInstaller::checkConnectStringFormat()
(flagged with @since 1.22). The patch provides a bunch of very basic
tests to test out the regex.

Change-Id: Ie3a0af9801bfdbc9129298be07e1676145a1607a